Hi.
Thanks for your query.
Read your history and understood your problem.
You have a problem for over 30 years, you say.
Pain in the left upper side of the abdomen, like
Pleurisy, increases on overwork and over eating.
The probable causes are:
Looks to be affection of the inter-costal nerves which gets exited on the factors you mentioned.
The overwork can exhaust the muscles of the lower chest and / or upper abdomen causing stretching of any of the inter-costal nerve causing this typical pains.
Full stomach acts in the same way.
I would advise you to
consult a General Surgeon, discuss about this issue as I mentioned.
He may have a clinical examination and may ask you to over-eat and see what the problem like.
If required
CT scan of the upper abdomen and lower chest may find some abnormality of the ribs.
Local injections for inter-costal
nerve block can be tried as a diagnostic and therapeutic test.
Ct will help to prove or to rule out other causes.