Read the history of RLQ pain with lower and pelvic heaviness and soreness for few months. IT is good that the colonic pathology is ruled out by the colonoscopy
The EGD Endoscopy showing inflamed stomach that is gastritis must be secondary to the pelvic pathology.
Most probably you are having IBS- Irritable Bowel Syndrome
or PID- Pelvic inflammatory Disease
I would advise the following:
All relevant blood tests including Gold Quantiferon test for Tuberculosis
, Typhoid. Urine and still tests.
A course of an antibiotic.
Gynecologist's Pervaginal examination and opinion.
A course of an antibiotic and metronodazole.
Addition of probiotics and a antispsmodic plus antianxiety tablet to soothe.
CT scan of the abdomen to rule out other problems
if every investigation is normal.