Thank you for the additional information.
Endometriosis is a condition in which bits of the endometrium
(the inner uterine lining) develop in sites other than the uterus
. This causes pain which is generally more during the periods ( since the endometrium bleeds during the periods).
The pain from endometriosis is usually not constant.
Pain in the lower right side which is constant and affecting your eating is more likely to originate from the colon. Conditions like IBS, Crohn's disease, ulcerative colitis can cause this type of pain.
This type of pain can also be due to pelvic inflammatory diseases. Please ask your gynecologist to order an ultrasound as well as take a vaginal swab
for a lab test.
While you do need a laparoscoy to rule out endometriosis, you also need a stool test and a colonoscopy
to check out the colon.
You do not need to wait for a month for a diagnosis. Please consult a internal medicine specialist or a specialist in gastrointestinal diseases.
Meanwhile please take Ibuprofen 200mg thrice a day after food - it is available without a prescription.
I hope this helps.