lactose intolerance, celiac disease, did your gyn get a vaginal probe ultrasound of pelvic organs?, look at your diet-in trying to eat healthy is your diet heavy on gas producing foods. Many alt med experts feels most of us are deficient in digestive enzymes(so food sits are too long producing toxins/gas, etc) so you could be acid deficient. i think they use papaya extract etc, but look it up. if tyou see annother dic it might be GI since Gyn was a good first choice and if pelvic sono wasd clear...
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You could be suffering from an inflammatory bowel condition such as Celiac Disease/Ulcerative Colitis/Irritable Bowel Syndrome/ Crohn’s disease. Other than that it could be due to H pylori infection. It can also be food intolerance. Diabetes can cause slowing of gut and can cause bloating and hence get your blood sugar tested. It can also be due to excess consumption of food rich in sulfites like juices, molasses, yellow dye in ready made food stuffs, and red wine. Sulfites are present in lesser amounts in mashed potatoes made from dry powder, pickles, tinned shrimp, cookies, crackers, and readymade pie dough. Constipation can also cause bloating. Very sedentary lifestyle is another cause.
Please consult your PCP for primary examination followed by proper referral. It is difficult to comment beyond this at this stage. Take care!