Your story is typical, in my opinion, of why it is often so difficult to accurately make a bipolar-spectrum diagnosis today. For example, based solely on your initial episode, you would not qualify under the current DSM for any diagnosis other than a drug-induced psychosis, I do not believe. But then it lingered and then, later, with no marijuana in your system, you had a depressive episode. Is this part of the original thing, is it evidence of bp2, or do you really have bp1? Very hard to tease out.

I went through a very similar situation and one of the things I did that helped clarify things was to write out a detailed life chart. When you see it on paper, it sometimes becomes a bit clearer. Maybe read about life charts and see if that is something that interests you or not. In my case, we stopped all my meds while I was in the hospital. I do not recommend this. I had a massive mixed episode months later and the diagnosis was confirmed. Sometimes, it takes time.

I live in a state with legalized marijuana which is also an absolutely gigantic producer of the product. It is everywhere. In my town, I would say it is considered common knowledge that weed may cause psychosis in some persons. This is just accepted as fact here. FWIW.