Depressed over my ex?

I think a lot of your depression is stemmed from your Uncle's death. You are identifying happiness with your ex because you have not dealt with the loss of someone you love and are now putting the responsibility of your happiness on one person. I think you should seek some professional help in order to deal with the tragic loss of a loved one. Your self destructive habits are a direct result of depression and anxiety. Focus on yourself, focus on what you need in life and where you want to be in the future. You are young, you need to stay focused on your education. You need to get through this, because life unfortunately gets worse as you get older, problems are bigger, pain becomes more intense. If you can not handle it now, you will be a very weak man in your adult life.