Be happy for him that he made it to college. I do know how you feel but beleive me you are fortunate! Of my 2 kids,Son one went to war, and son 2 abuses the bottle to the point we rarely talk :( So pick up your chin and do a happy dance! You are blessed.
Oh and pets help if you like them and are alowed to have them. Start a quilt for him that may help keep you busy as well!