You've been a passive observer for a long time. Psychiatrists usually see their patients for a few minutes when they're at their worst, and have no perspective on how the patient actually does on a day-to-day basis. They haven't observed the patient between 'episodes'. You can help fill in the gaps in the psychiatrist's profile of your friend.
> but stress got to him and when comparing to when he had his episode
Stress is the major factor in most of these conditions. My recent comment about the Quakers and their asylums [0] is relevant: most of their patients got better with nothing more than 4 meals a day and the expectation that they could recover if given appropriate support.
Malnourishment is the other major factor. My friend's involuntary treatment provider eventually did a genetic test that found she can't turn folic acid into folate. Getting supplemental folate has made a big difference for her misdiagnosed "mental" condition. B-vitamins... eggs... more coconut oil, less vegetable oil... fewer grains, more fruit (juice, apples, etc).