Yeah it's not good when mania sets in, your medication should really have alleviated that by now. I cannot stand to be manic these days . As a teenager I just rolled with it, not now, no way. When I am a little wound up I sort of divide my attention. Ill have music on while I read something light like graphic novels.
The internet is the best thing in the planet when manic lol . I wouldn't do intense exercise . It might tire your body but not your brain.