Hypomania is so seductive. It's like the thrill of getting away with something naughty, I think. It's too bad mania can suck so bad. I had some similar troubles when my mood was in check...more with the constant intrusive thoughts and slightly less with anxiety. It just so happened that during a normal mood phase my pdoc added ADHD to my diagnosis and tried me on meds for that. When we added the ADHD meds...poof... the nagging thoughts and anxiety went right away.
I worried the anxiety would get worse because I've observed that side effect with my kid's meds, but it had the exact opposite effect for me. I also slept way better once I started the ADHD meds (haven't had to take a sleeping pill in months). I still take my mood stabilizer, too. I've found the ADHD med makes "normal" mood much more bearable for me. Of course, I'm not suggesting that you would have the same results, but that was my personal experience.