Whats wrong with me...

The past couple of weeks I've been feeling terrible; no motivation to do anything, constantly depressed or irritated, staying up late, loss of appetite, headaches.. is it because I have nerve entrapment and arthritis in my ankle and have to get a 4th surgery on it? I'm starting to think maybe it's just pain but maybe it could be something else.. maybe I just want to get engaged.. who knows.. any ideas anyone?