What did the physician who did your endoscopy say about the procedure's findings? How long have you been experiencing these symptoms, and is it the same as whatever caused you to have an endoscopy performed in the first place? I can't really make any (totally not professional) suggestions as to likely causes without more specific symptoms than "tummy issues" but I've had more than my fair share of tummy issues too.
My GI diagnoses are irritable bowel syndrome (not to be confused with inflammatory bowel disease, the category under which Crohn's & ulcerative colitis fall) and a hiatal hernia which causes chronic acid reflux. After copious GI testing, there's currently no reason to believe that either diagnosis is tied to my arthritis, although the IBS does sometimes flare at the same time. I think it might be that both flare for the same reason - stress, sleep deprivation, etc. - and not because they're directly related.
Mary, 25, happily married pro photographer, momma to 2 great danes.
Dx: Psoriatic Arthritis, Fibromyalgia, Psoriasis, Sjogren's, IBS, Hiatal Hernia, & possible Endometriosis.
Meds: Stelara, Methotrexate, Relafen, Omeprazole, Lyrica, Tizanidine, Voltaren Gel, Tramadol