Why do I feel like bugs are crawling under my skin?

I feel like bugs are crawling under my skin. I also have bruises all over the place. I had been taking a drug for keep me awake. Are these side effects?|||did this drug have ephedra in it? if it did, it could definitely be a side effect of it--or any drug that is designed to keep you awake. massive amounts of caffeine and other drugs that keep you alert will sometimes make you feel jittery and itchy like that.|||Yes.