Is this a manic depressive disorder or OCD?

Whenever there's something I'm excited about it becomes a sudden euphoria and I just can't let go to the point that I can't sleep. It's also the same way when there's someone or something that makes me frustrated and disappointed. Before it was worse, because I just can't release myself from my irrational belief that I can never sleep. Now I can say that I can manage myself despite my irrational belief. Tell me. Am I having some kind of disorders? I would like to know for I want to help myself more. Please give me some clues.