I would worry that so soon after your IP that stopping medications could be dangerous or at least lead to another IP stay. This is based on my own experiences. However, I definitely had my non-compliant periods in the past. Not in recent years, though. Or at least not to any major degree.

As for super small degree, I've recently reduced my pregabalin down to 50 mg per day after my psychiatrist upped it to 100 mg per day. I did so without him knowing, but I will be telling him next week. My husband will be going with me and supporting me on this. However, I am quite stable compared to a person fresh out of IP. Quite. My reason for the reduction was similar to your grievance. Weight gain. But I am not only on pregabalin. I also take therapeutic doses of carbamazepine and quetiapine ER, plus some lamotrigine. I definitely won't be reducing or stopping them. If I did, the chance of me becoming very ill with my bipolar disorder would be very high. Why would I want that after so long stable (or mostly so)?

In the past, I stopped other medications because of side effects, though mostly not weight gain. Other factors that led to non-compliance were chasing mania and a notion that I could "control my moods on my own", which was sadly not the case. Having alcohol sprees was also a factor, at times. Frankly, such alcohol sprees were mostly caused by mood episodes. Kind of a chicken or egg situation.

I recognize the role of the kindling effect in my past illness days. Quitting meds really sparked it. It worsened my manias (often mixed manias) and made them harder to stop. It made me more likely to quickly have another bout of severe episodes. After one mania after another (one hospitalization after another), I finally crashed big time. As a result, I needed ECT to get me out of it. I believe my brain was sort of injured, to a degree, because of all of the episodes (not necessarily the ECT). I needed years for my brain to heal afterwards.

I totally get your frustration, but rather than up and quit all meds, I'd recommend you have a serious talk with your psychiatrist. You have the right to say "No more!" to a particular med. If they push you to reconsider, you have the right to repeat "No!" However, it's better to try something new when quitting than to take nothing at all. You mentioned Invega. Maybe that med?