Remember you are free to disagree with his diagnosis. You may argue about it...or you may chose to agree to disagree.

T’s sometimes get it wrong.

If he’s prescribing medication and you feel it’s helping, trust your feelings. Feel better.
If he’s prescribing medication and you feel it’s not helping, you have every right to refuse it.

About trust- trust is earned through trust-building experiences. You don’t need to give your trust away to him just to people-please him or to try to be a ‘good patient.’ You don’t need to give your trust away for fear of rejection. With everything you have been through he should certainly understand that concept.