I have been contemplating psychology and the existence of spiritual things (God, Jesus, Satan, guilt, temptation, etc.). It seems these two work against each other, such as bad thoughts coming from Satan can also be described as a chemical imbalance. Psychology can be used to explain pretty much everything that happens to us mentally. Satan tempting us through thoughts can be explained as intrusive thoughts.
A question I have been asking myself to help me understand yet I cannot wrap my head around it is why wouldn't God work through psychology? Is our mind designed to work in a way that allows us to experience spiritual things?
I am unable to establish any conclusions in this matter. I feel my belief in God and my need for Him being shaken. A lot of people come to know Christ when they are at the end of their rope, or when in psychological distress. Is it ok for people to hit rock bottom so they call on God for help? If people are psychologically healthy do they even have a need for God?
If psychology is practiced without God than I'd imagine it can leave someone with a sense of self righteousness as opposed to God's righteousness. Which would be the reason you're feeling confused about the two because they are in fact different.
But it sounds like your faith is being shaken due to the fact you're "psychologically healthy" and at peace, to the point you're asking the question if the "psychologically healthy" even need God. If there's any point since you're at such peace as it is. And my answer would be that when you're self righteous...you can be deceived into thinking there is no need for God. Because when you're self-righteous YOU are your God. You are the author of all that is good in life. Which is not the case.
What I've come to understand through prayer and worship is that virtue itself is the thumb print of the Holy Spirit. The self-righteous man or women or the "psychologically healthy" who think they're responsible for their own virtue, who think they don't need God because they're "psychologically healthy" and because they would never steal or kill or whatever, are completely oblivious to the fact that for every single self righteous person who won't do bad, there are plenty more persons' who will eat them alive. Who will exploit them for the sake of any form of self gain and that this type of behavior/doctrine is exactly what can shape the world for the worst. God's word specifically goes into detail on what makes the the righteous through God and what makes wicked what they are, which is the worship of their flesh through acted out desires etc etc.
Now this is where the polarity of good and evil, for one: can't be denied and second: should be examined. The self righteous and "psychologically healthy" who don't need God, are oblivious to the authors of good and evil. They think good and evil come from man himself. So that means they have to put their faith in man to do the right thing. Which leaves them vulnerable. Vulnerable to what? A wicked man can put on a front as a righteous man in his plot to exploit his brother, which would be the act of deception. But a righteous man, who understands The Word of God, should be able to see what that wicked man is about just based off his chosen affiliations with the world, which God's word exposes as a source of evil. You can't worship God and the world.
(Mathew 6:24 No man can serve two masters: for either he will hate the one, and love the other; or else he will hold to the one, and despise the other. Ye cannot serve God and mammon.)(1John 2:15-16 Love not the world, neither the things that are in the world. If any man love the world, the love of the Father is not in him. 16 For all that is in the world, the lust of the flesh, and the lust of the eyes, and the pride of life, is not of the Father, but is of the world.) And again, when the doctrine of deception is put above all, how would a self righteous/"psychologically healthy" godless man even know? If he's godless he has no idea what the truth is. He can end up being deceived to believe just about anything.
So my point is this- We have the "psychologically healthy" or "the self righteous" who for the sake of this discussion DO NOT need God- and we have them not understanding who the author of their inner virtue is, which is God and his Holy Spirit. We have them unable to come to grips with the reality that 'they are NOT the author of their own virtue,' that virtue is a trait, a gift, a blessing, a truth that derives from Good, which is within the polarity of good and evil, which we examined above, and that the author of that Good is in fact God and his Holy Spirit.
So yeah, the "psychologically healthy"/self righteous man who for the sake of this discussion does not need God, who find no fault in themselves are quick to dismiss the idea of a God because they think they are the source to which alllllll that is Good. So from that you can understand why God has some people "hit rock bottom" as you put it. It forces them to succumb and submit to seek God instead of themselves, if they're wise that is. But some who are too self-righteous, who are too focused on themselves, in the time of tribulation will become a coward and only look after themselves. Which is why The Bible doesn't have anything good to say about those kinds of cowards.
(2 Timothy 1:7 For God has not given us a spirit of fear, but of power and of love and of a sound mind.) ...sorry, going off on a tangent. But cowards will be put into the lake of fire with the murderers etc etc.
(Revelation 21:8 But the fearful, and unbelieving, and the abominable, and murderers, and whoremongers, and sorcerers, and idolaters, and all liars, shall have their part in the lake which burneth with fire and brimstone: which is the second death.)
Also this my testimony to the mercy of God, I could be wrong but this is just what I've seen in worship and prayer and that is The Holy Spirit's influence is given to everyone, even non believers. It's influence is soo merciful and motivated by unconditional love that it will leave it's mark on any heart. That's how truly merciful God is. The tragedy comes when man doesn't address it's author, which is God and Jesus Christ. And when man doesn't address the author of virtue, that's a denying of the Holy Spirit to some degree. But without the Holy Spirit's influence, even in the non believer....I think the world would be completely mad.
Also I haven't addressed sin or the importance of Jesus Christ throughout this entire post. But I think we can all testify that sin degrades even the "psychologically healthy." Inside and out. It's wage truly is death.
I was diagnosed with PTSD too 'cuz of seriously traumatic abuse. I can't take meds because I'm allergic to 99% of drugs. They make me feel like I'm trippin' on shrooms. 
