Which AD are you taking? I have to admit that I'm a tad jealous of you. I'm longing for a burst of energy. My flat is such a mess. I haven't had a burst of energy in years.
Anyway, I do know that some people can get manic or hypomanic episodes when they take an AD. That could be what's happening to you. You should talk to your doc about it. The physical side effects -- like nausea -- usually go away after you've been on the meds for a few weeks, but it sounds like you might be getting hypomanic and that's something I think you should tell your doc about. Good luck.