Boy do I know that feeling too about not wanting to have another manic episode.
I was diagnosed at age 30 also (I'd been having problems since I was 13 but no one figured it out) and am 52 now.
My manic periods just kept getting worse & worse until my last one, and I had a total psychotic break with reality. It was a miracle that I got help & that I am alive.
I NEVER want to go through that again, and that alone keeps me compliant on taking my meds.
Thanks for being so honest! How old were you when you started having problems???