Is there someone you trust deeply whom you can give your credit card to. It is best to get a stop to overspending ASAP before you empty your account or get into horrific debt. You're doing great to keep a straight face in public. If you still can't sleep maybe try some YOUTUBE meditation streams. They have a tonne of different types like Forrests, ocean and other stuff if nature isn't your thing. I find when manic they may not always put me to sleep but they do give my mind a rest.