What was reason  and who is the reason  for the breakup?!! Was it Consciously taken mutually!! With those answers,  do consult a psychologist.

Hi. I can understand what you must be going through. Coming out of a relationship after this long is never easy. Some symptoms for few days is considered normal. But if your symptoms continue for long, you might consider seeking professional help. Try talking to someone close and venting out your feelings. Start exercising daily. If you feel that's not working, talk to a Psychiatrist and get yourself evaluated.