Talk about my feelings

I'm 19 years old. Sometimes I feel in a normal mood like most people, but other times I experience intense happiness, as if I were a superhero. My thoughts race so quickly that I forget some of them, and I struggle with poor focus and distraction. I become extremely social and tend to spend all my money carelessly and irresponsibly. Then suddenly, all that energy disappears and turns into deep, severe depression. I prefer isolation, and any unusual movement irritates me and completely ruins my mood. I can sleep for a whole day or even longer.