Well , considering your brother in law is a psychologist I would heed his advice , I do not think a PCP has the knowledge to manage mental illness and the types of medications. Very complex.

Its doubtful you would be seeing a Pdoc weekly for long ,usually once your on a medication that seems to be helping your visits will stretch out to months.

Have you looked into local mental health clinic, usually run by counties , they offer sliding scale co pays or even free ones and many times have samples of medications to try.

Maybe your brother in law would know of local Pdoc's or clinics that can help you with your current financial situation Or even offer you a small loan to get your started with a Pdoc. Is that a possible option?

Good luck