I am not a psychiatrist but I seem to recall there is a condition along the lines of narcissistic personality disorder (Sp?)
From memory, and I swear to God I have not googled, the symptoms are
1) Sense of inner self worth leading to over-endulgence in ale and food
2) Sense of grandiose importance
3) History of rejection
4) ALL attention, even negativism, is a bonus
5) Hot and cold mood swings
6) A deep sense of envy. Will try to shatter any worth
7) Sexual perversion to ease guilt.
If anybody can shed further light on the subject, old tubby may get the help he so desperately needs.