24hrs of pain under high left rib cage, shoulder and back. 3x today straining with diarrhea. have crohn's and ibs. flare that high?

Go see your doctor: This suggests irritation of the diaphragm on the left side. This may result from perforation of the gut due to the intestinal inflammatory process, or an inflammation or enlargement of the spleen, among other possibilities. You should definitely go and have this checked with your doctor who manages your bowel disease. Good luck.

Possible: Yes, if you have the diagnosis of Crohn's disease then having this kind of pain and diarrhea could be the manifestation of exacerbation. You should see your Gastroenterologist. Thanks