Stomach pain when I eat. Had h.Pylori breath test, stool test & celiac tests all negative. I am scheduled for a hysterectomy in a week. I am scared.

may need an egd. You may need a endogastroduodenoscopic exam for better evaluation if still have stomach pain done by a gastroenterologist. I would strongly consider delaying a hysterectomy if you still have these other symptoms unless the hysterectomy is considered an urgent procedure.
speak with your. Docs as u should have your GI problem solved or under control before other surgery is done as it could become worse after the surgery, but please discuss with the GI an gyn and follow their rec or get a second opinion.