So peacebestill, are you trained in clinically diagnosing a mental disorder? Could you even recognize mental illness versus demon possession?
I think if you are stuggling with your mental health, you really do need to see a doctor. I have seen people see demons behind every chair, table etc. These people were healed by taking medicines.
I minister to those with bipolar disorder, and many are Christians with a strong faith in Jesus. I think they would be insulted by this characture of mental illness.
My thought is generally, the devil does not attack the mind, but rather the spiritual person. That is why we do not struggle against flesh and blood (the brain!) but rather stand firm in the armour of God, and use the Word of God as our sword.