Severe lower ab cramps, burning colon, nausea, fatigue. gf and df & was temp paleo. is this ibs? ulcer. colitis? (worse if eat meat &, oddly, mustard)

IBS: More likely it is IBS. Ulcerative Colitis is possible but you would have bloody stools. You are likely allergic to mustard so don't eat anymore. You are probably deficient in stomach acid or digestive enzymes so meat is problematic. I would do food dairy for 1 week to see if you are allergic to other foods such gluten, dairy, etc. I would recommend strong probiotic and digestive enzymes.