Wanted to know wether Endoscopy is required to Diagnose IBS

Hello, I am 32 years old. I had been having lot of pelvic pain, and was diagnosed with endometriosis and put on treatment with Regesterone. I took it for about 4 months, and it worked wonders in releiving pains nad symptoms. I have stopped taking it since last 25 days, and have been having stomach bloating, no periods, a bit of brown discharge (only for 2 days after stopping with the pill), ocasional nausea, mild lower stomach cramps, low back pain, weight gain, on and off diarhhea, breast soreness and nipple sensitivity and drynes, jely like clear and odorless vaginal discharge. PLease tel me if these could be due to pregnnacy? how long does it take to get pregnant after stopping with Regesterone? Am I pregnant? will I be able to get pregnant?the symptoms used to come back in between when missing 1-2 pills, but used to get controlled again with continued use of teh Regestrone tablets. I have not got any of my endometriosis symptoms back after completely stopping with taking them. Please help...should I get tested for pregnancy??

I get a sharp excruciating pain in my pelvic area on the left side and on the very bottom of my tailbone. When I get the pain on my tailbone I have an issue with walking, sitting and laying down same with the pain in my pelvic area it hurts extremely bad. Along with these issue my menstrual flow is usually a dark brown to black in color. I frequently urinate, and it is extremely painful during sexual intercourse, also frequent constipation, and pain when producing a stool. I've had this issue since I was 15 I am now 22. I told my former gynecologist endo runs in the family and that my mother had it along with my grandmother and aunt along with ovarian cysts, and she said there is no reason to have me tested, even though my mom's doctor highly suggests it. What should I do about this? I've tried taking Tylenol, Ibuprofen, and birth control pills to help with the pain like the doctor said and nothing has helped.