Abdominal pain for two weeks doctors think it's gastritis or constipation i am now having flu like symptoms no nausea with a fever what's going on?

Many causes: Many possible causes for flu like symptoms with abdominal pain ... Evaluation includes making sure you aren't pregnant, doing a pelvic examination to look for uterine and ovarian causes sometimes a simple trial of antacids (h2 blockers) can reveal the source. Please be sure to get followup with your doctor if this doesn't improve on its own.