MDMA's effects are pretty similar to mania. I had the shifts from being down to super hyper before I'd ever tried MDMA and it's not a side effect I've ever heard of, however depression and anxiety are common side effects when on a "come down". Not being able to sleep is common as well, I usually can't sleep for around 3 days afterwards. They can last up to about a week generally so if you've taken it fairly recently it could explain some of it.

Hope that helps.