I kind of rebuke the worldly views on health and mental health. I like to think that God is always with us, and that any disarray we feel is often a somewhat disconnect from God.
I'll tell you how to override the bad thoughts you have. The thing is, what you are doing is trying to get rid of them or push them away. No matter what, I think that these thoughts are always lurking, spiritually. Maybe there are spirits out there influencing us, or trying to take over our mind and body. Jesus sure seemed to believe in them. But modern science doesn't does it? It completely ignores it, or sees it as a symptom. We each have our own perceptions. Some will say maybe it is this diagnosis, or that diagnosis, which I really believe is unhelpful unless you are looking to suppress them with drugs, or psychological manipulation/psychiatry. This is the American way of healing, and often, it means that many people are 'locked into' that diagnosis forever, just waiting for the day they die. Temporarily yes, but not as a cure which is not really a cure. God is capable of curing anything, right?
Anyway back to the point. If you want to override the bad thoughts you have, you have to replace them with much higher thoughts which are closer to God. And if you ask yourself what can you do or think that is better, you WILL get an answer. However you might find much resistance to it. You have to take a leap of faith.
Think on These Things
Finally, brethren, whatsoever things are true, whatsoever things are honest, whatsoever things are just, whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good report; if there be any virtue, and if there be any praise, think on these things. Those things, which ye have both learned, and received, and heard, and seen in me, do: and the God of peace shall be with you.
You will find that if you think about the thoughts which torment you, they go against that whole scripture right? And therefore, it feels like the God of peace is not with you.
Well try it, and observe the strength in it. Spend some time trying to find those good thoughts, that maybe in some calamitous moment or experience were pushed to one side (our natural blueprint in the image of God, love and peace), and into a habit of the opposite (fear and disconnection). For being closer to God, brings you freedom from your burdens. Jesus is of course the way, but in the sense of understanding how to be or think as a human. That is what it means to me anyway. And often ones greatest burden is their own thoughts, more than any struggle they are going through or have been through.
You won't find many doctors or psychiatrists out there who simply prescribe optimism, faith, and love. It seems not even people really do either, but when those kind and humble souls appear, we all appreciate them. And yet these things, optimism, faith, and love are the strongest cure, that no scientifically intelligent mind, is able to comprehend in a tangible way. That doesn't make it not real. God's way is the most real way for anything.
Incurable really means, curable from within. And if one thinks that the chemistry of our body cannot change and you are stuck that way, I say no, I have optimism for greater possibilities, that all things are possible.
If only the world was a world filled with love for each other, our neighbours, complete strangers, even those who do bad things, we might realise that the greatest doctors out there are those who are around us. God works through all of us, not just a select few, or an elite, or those who happen to be well-educated. Even the poorest and most wretched soul can give hope where there is none.