My 16 year old son has been having on and off again stomach pains for the past two months. He spent 8 weeks in the mountains of Utah and got quite sick the last few weeks (diarrhea and vomiting). It seems like every two to three weeks he's either constipated, vomiting and has diarrhea with stomach pain. These past few days he had all this with intense pain in his lower right quadrant of his abdomen. We thought appendicitis, but after a CT they said mesenteric adentis (inflamed lymph nodes of stomach). I'm concerned there's something more since it's been going on for a while. Wondering if anyone has had similar symptoms and if you had a different diagnosis.