I was 'diagnosed' with IBS at 16 years old. I've been living with it for 4 years. The pain can be pretty horrible from time to time, but those are rare occurrences. I'm very blessed to have a high pain tolerance as well, and like most of you guys who mentioned, tylenol and other similar basic painkillers do not do anything for me. Aleve seems to be the only thing that will even put a dent into my pain, but most of the time I can handle what the medication brings it down to.
I've only had to take some serious pain medication (Darvocet, etc) only three to four times in four years and I've been to the emergency room about the same number of times. Unfortunately for me, I never really found out what directly caused my pain issues. I could eat over $12 of Taco Bell and be fine, but eat an apple and my stomach decides it wants to party, which isn't exactly fun for me. The only thing I could ever relate it to was a stress factor (but that only explained the problem if I had any 'episodes' during finals weeks for school). All the other time I had pain, stress, school, or work wasn't involved. So, unfortunately for me, i'll probably never know the direct cause. Most of the time, my intestines just wouldn't break down the food I ate and I would just have the runs all day. And that problem was just never looked at by the doctors, but I always felt like my condition had something to do with my intestines not working properly.
Also to explain the 'diagnosed' term i mentioned at first, the doctors didn't outright tell me it was IBS, since I was 16 at the time and IBS is extremely uncommon at my age (according to the doctors). At the local hospital by my house, I was the youngest patient regarding gastrointestinal pain/issues that my doctor has ever had, especially since the age average was in the late 30s/early 40s. After several inconclusive tests and shrugging shoulders for a few months, they just decided to diagnose with IBS. I'm still not sure to this day if that was an attempt to actually diagnose my condition or just to label my condition just so my parents 'felt' like they knew what it was.
Has anyone else had any similar problems?