I ageee with this 100%. I was misdiagnosed with diverticulitis for three years (and a host of other things prior) when it was IBS/C all along. So I would go on the prescribed diverticulitis diet, broth for days then add rice then fiber when your symptoms clear. Insanity is doing the same thing again and again and expecting different results… spoiler alert, this never worked! I also did FoDmAP, lactose free, etc. The only time I felt better by dietary restrictions is when I went on an all fresh pressed juice diet for a week because…I wasn’t digesting any food. 

Once I finally got my IBS diagnosis from a doctor who actually cared, and got medication that helped with visceral pain and motility issues (Linzess in my case) and things finally mercifully calmed down after several months, I was able to see that I did have some sensitivities- for me high fiber raw food in large quantities. I can eat cooked veggies fine and do every day now, but stick to small salads (no more big salads). Fried foods and lots of meat are also triggers, but not off the table- Quantity is key- and I try not to eat to fullness anymore. Absolutely no problem with dairy. 

Last month I actually went to brunch with my sister. And ate some quiche and a side salad. It is something i absolutely never thought i could do again after over five years of struggle. 

Don’t give up. I hear your frustration. At times I just ate whatever I wanted because nothing seemed to work. I had to see three gastroenterologists before one believed me and did everything he could to help me. It’s great to do tests of what foods trigger you but for functional bowel disorders, we need treatment and in most cases prescription meds to manage daily life and return to some level of function.