In your opinion, are mental illnesses real medical condotions? Some would say, having depression is really just a sign of spiritual weakness and laziness covered up, others say taking medication for mental illnesses is wrong, and many more say going to a nonchristian therapist would be harmful. In the Bible you would certainly not find anyone seeking help from a shrink... What is the right thing to do for a christian who experiences symptoms of a mental illness, be it depression, ptsd or schizophrenia?
Mental illness is a dysfunctional combination of philosophy and environment (ie: the environment is triggering the thought processes to operate in a way that is unacceptable).
Sometimes the environment, being evil, needs to be changed so that it is not doing such harm toward the one, and then receiving proper care from the world in an environment of love, The Holy Spirit (ie 1 John 4:7-8) is able to heal that one's heart so that they do find the world acceptable again.
Other times, the one's philosophy (expectations, beliefs etc) have diverted from what is holy, good, acceptable etc, so that they object to the environment, even though the environment truly cannot be blamed (this is when their perspective alters reality in order to misrepresent it to their mind).
Because we live in a world that is spiritual and we do wrestle against an organised adversary that manifests through multiple channels and agents, the battle for our soul is that very assault of influencing our philosophy through gradual building-up of that philosophy through series of interactions with people and ideas that they plant in our mind (seeds that then grow - consider Matthew 13:27 with Psalms 24:1 and Matthew 25:41).
This is why it is commonly acknowledged that skilled and effective counselling can bring about healing for mental illness while medication does not have that effect primarily - it only makes the symptoms less severe, giving time that in many cases, the person does learn through community counselling, such as described, and they become healed that way - by learning new strategies for perceiving and coping with the reality of the world.
"Either make the tree good and its fruit good, or make the tree rotten and its fruit rotten; for the tree is known by its fruit."
Matthew 12:33