If you have a temperature then go to urgent care oremergency room. It sounds like an appendix, gallbladder, diverticulitis, or a kidney stone. A temperature will tell you it is an infection making you miserable and it’s getting dangerously worse. If you do not have a temperature, then it could be the IBS and if you change your diet immediately, it will stop the pain. It’s very easy to tell if it’s the IBS making you miserable. Start the FODMAP diet by the Monash university. It is free just Google and go to their site. If you don’t have time to figure the diet out, just eat white rice and white chicken meat ONLY for a couple days. If you can figure out the other safe foods to start with. I think banana orange cantaloupe. Spinach are OK. That will tell you for sure if it is the IBS, which is causing your nightmare. I had two gastroenterologist who ran all the tests and I felt like I was dying. I went to two dietitians as well and they made it worse by putting me on some crazy kind of diet. The FODMAP was not recommended. I don’t know why. But it turned out that my digestive system and intestines had failed and eating regular food became impossible. I didn’t wanna believe it, but that’s what it was. I had to give up garlic, onions and all foods with “inulin.“ I know what the hell is inulin? It’s a non-digestible cellulose like the strings in the celery. Turns out there’s a lot of it in the foods I eat. It also turned out. I was intolerant of lactose and gluten. It only took me 48 hours of eating, the white rice and chicken ( actually overnight I felt better.) it took me a year or two to realize I had to stay on the diet, but you expand your foods to realize what causes problems. It took four years to heal my digestive track and intestines now seven years out I can eat a little bit of the problem foods without dying. It took me a couple years to accept that my body would no longer digest foods that everyone else can eat. No medicine I found substitutes for everything (scallions green onions instead of onion essence of garlic instead of garlic, fermented cheeses, fermented alcohol sourdough extra fermented bread) if you have a temperature you must pursue this so the infection doesn’t threaten your life. Don’t delay eithe way! I just saw the date on this. I guess let us know if you got it figured out.