I don't know what to do with myself?

insomnia, irritablity and rapid changes in mood are typical symptoms of bipolar disorder. Check out "bipolar disorder", "bipolar self help" and "bipolar blog" at www.depressiondodging.com to learn more about bipolar disorder and how to deal with it. You might want to see a psychiatrist and get evaluated. If you're bipolar then medicine can help you sleep at night and be less irritable.