Hi, Long story, but I'll try to just hit the pertinent details. I'm a 39 y/o female who started having vague left abdominal pain early this year. I was using Alli (orlistat) to lose weight for over a year. I lost 50 lbs. but was starting to get uncomfortable about using a drug for that long. Then I started getting this light burning twinge on my left side. It felt like my intestine was inflamed, but the Alli caused constant loose stool, so I couldn't tell if I had intestinal upset or not. After several weeks of this pain coming and going, I decided to quit using Alli...just in case. Then, two days after my period in July, I realized that a burning pain had settled lower on my left side, around my left ovary. It felt kind of like menstrual pain, but my period was over. The pain persisted for 3 straight days, and I became concerned. I saw my GYN, she felt nothing amiss in my physical exam but scheduled an Ultrasound for the next week. While waiting for the US, the pain became worse so I saw my Gen. Phys. in case it was intestinal not GYN. She ordered a CT scan and gave me the instructions to visit the ER if I developed a fever. That very night, I spiked a fever of 101, the pain got very bad, and I went to the ER. They performed US early and they read the CT I had earlier that day, and did blood tests. All came back clear. I had no masses (good!), no cysts, no diverticulitis, etc. I was released with a pat on the head.Fever went away, but returned in a couple of days. Went back to GP who sent me to GI. GI put me on antibiotics for a week which knocked out the fever, then did a Colonoscopy. That also came back clear, no masses, no colitis, etc.All the docs want to say I have IBS, but the fever confuses them. The fever has never come back, but the lower left pain persists. It will go away for a few days or even a couple of weeks, then come back and settle in for another few days or weeks. I also still get the burning pain higher up on my left side, and, lately, twinges on my right side and under my ribs on the left. Before I took Alli, I used to only have a BM once a day, or even every other day. On Alli, it was every day. Now that I'm off Alli, I still go 2 - 4 times a day. It is soft, but not diarrhea. So, I do go more often than I used to, but I don't know if I screwed myself up with Alli, or if it is a sign of IBS. I also don't really get bloating or the feeling of intestinal upset. Going to the bathroom seems to have little to no effect on the pain. It feels like the OUTSIDE of my intestine hurts, not the inside, if that makes any sense at all. BTW, the low left pain is weird. Sometimes it settles over my ovary and feels menstrual. Other times it seems to run from my groin to my left hip, burning all the way. Sometimes it shoots down into my left thigh. It's not a horrible pain (like when I went to the ER), but it's about a constant 3 or 4. Enough to annoy me and depress me.I've never had pain that I couldn't attribute before. It's really starting to get me down. Every time I feel the pain, I worry. I try not to because I've had all the big tests, but it's creepy to have near constant pain and not really know why. I find myself fighting depression. Anyway, I'm sorry this is so long. I just needed to write it down and see if it sounds like IBS to anyone else here. Thanks!(BTW, I've considered that I may have something like Endometriosis, too, because I have had my two worst flare ups following my period, but since pain is my only symptom, it's hard to know without having exploratory surgery. Plus, I have pain all along my large intestine, so...I don't know. Sigh.)