Can you try wordless music? I listen to something called "Chinese flute" which is really relaxing and has lots of nature sounds (Chinese flute is very general, not something specific) but it helps me. I tend to have a lot of trouble with music with words though; unless I'm very careful they stick in my head and torment me (much more psych related than just an earworm).

I hate suggesting this because i know how it was for me, but after a very bad mania in 2007 I realized I was using caffeine as an upper. I quit, cold turkey (which meant I had 3 days of headaches) and have only had the small amount that is in chocolate since. It made a very large difference. It was very hard to admit that I was using Coke as a drug but I was. Caffeine free me does better. (more I know I'd be even worse if I had caffeine than I see this on a day-to-day basis). I can't believe it's been nearly 8 years. It also helps with reducing calories which is nice.

But very good for backing off stimulants today! The more of them you can avoid the better life will be in my experience (having said that years later I did go back on provigil/nuvigil but in a very, very controlled way and when I was much more stable than Caffiene Woman had ever been) and I stopped them when I stopped working.