I have excessive foul smelling gas that words cannot describe with occasional abd pain and lower left pelvic pain ?

GI probem: This does not sound like a gynecologic issue. Either make an appt with a gastroenterologist (intestinal tract doctor) or call your primary care doctor for evaluation.

Gastrointestinal dz: Sounds like you have a gastrointestinal problem, could be an infection, possibly irritable bowel syndrome, or diverticular disease, but could be due to food allergies/sensitivities. You should see a gastroenterologist. Consider starting to modify your diet- and try to see if certain foods (flour products, milk products) seem to trigger the pain and gas.