You're reaching out for help, trying to get across to others how you are feeling and tha's a place to start. A psychatrist or GP might be able to find medication that can help, or run tests to see if there might be a physical cause. Have you tried to express to your family your friend or even your professors just how bad you are feeling? There might be a way if you get a diagnosis to get a medical leave or extension of some sort, get yourself well and the try again.