When I'm nervous I tend to get very energetic, twitchy, and uncontrollable. During work I literally stood up and danced for two hours straight because I had a lot of energy (I don't drink much caffeine). I also shake my leg violently during class because I can't stand up or anything and I need to burn energy. I hardly can control it and if I try to it just makes me uncomfortable.
Also when I have these bursts of energy they last a few hours and give me an urge to fight. Also I bite the inside of my cheek.