Oh yeah, the police have asked me if I was on drugs before too. I was walking about the town in the middle of the night.
Anyway.
I agree with the above about getting rid of manic energy. Taking up some artistic hobby might help. Something crafty maybe.
i can also relate to putting weight on when high being difficult. I used to tear through immense amounts of junk food but still lose weight, I think it probably speeds your metabolism up - the mania as well as the general increased activity.
Have you spoken to a doctor about it?
xx