Many of us Crohnies have GERD. I suffer much the same as you, and many foods upset my stomach. I live on a low residue diet and that seems to help me. I also take Prilosec. BUT....it could be as Randy said, referred pain or adhesions. Have you ever had any type of abdominal surgery?
My pain has always been in the upper right area, just at the bottom of my ribcage. And my Crohns was in the terminal ileum/cecum area. I say was because that area was removed with my resections. Hope I was able to help a little.
Hugs,
Gail *Nanners*