Hi Terra, I'm so sorry to hear about your tummy troubles! It really affects your quality of life. I had stomach/intestinal issues all my life. Bloating, diarrhea, pressure, constipation, nausea. After trying everything under the sun and in my own power, I saw an allergist to get the "scratch test." I found out I was intolerant to wheat, oats, avocado, apples, yogurt, grapes (wine-boo!) and coffee (double boo)!
Sometimes it's foods you wouldn't even imagine that can be causing you pain and upset. I used to eat an apple a day and would gobble guacamole! Since eliminating these foods, not only has my physical discomfort disappeared (except when I cheat and it's never worth it), but also the terrible anxiety that had plagued me sporadically!
I know allergy tests can be $$$, but sometimes it's worth it to feel better. If you don't have the funds, then I think an elimination diet is the next best bet. Also, remember that if you plan on having a blood test for celiac, DO NOT stop eating the gluten offender until after the test.