Help!What could be wrong with me? :/?

My symptoms include going from very depressed for a few weeks then being extremely happy and full of energy for 2-4 months then being depressed and suicidal again. I also have weird sleeping patters, I either need no sleep at all or I sleep all day and still feel tired I'm restless and get very upset over little things. i get angry quite often. I'm always distracted an get obsessed with thoughts that I must do a certain thing. I feel sad and empty too. I think about suicide a lot. I have really weird eating patterns...Those are only some of my symptoms. What's wrong with me?