Gastroenterologist
A gastroenterologist treats stomach pain.
Gastroenterologists - I had one for my ulcer
A GP should do.
dentist, eye doctor, podiatrist, pyschologist.
You should see a dermatologist
It depends. If you want to be a physician (a medical doctor), you should get into medicine. If you want to be a philosopher (a PhD), you should get into liberal arts.
Anyone with two hearts and a TARDIS
A cardiologist.
An Orthopedist or Orthopedic Surgeon.
orthopedic specialist.
You should always talk to your doctor if you have any kind of persistent problem. Internal allergy possibilities are no exception.