You need a new doctor. In the meantime I encourage you to go to the emergency room and demand relief. I doubt that anything less than several cleansing enemas at this point would be successful in relieving such a long standing case of constipation.
Once your immediate problem is resolved I suggest that you get yourself an enema bag and never let yourself go more than 2 or 3 days at most without either a natural BM or a cleansing enema.
It would also be a good idea to find a colon therapist in your area and begin a program of regular colon hydrotherapy.