Non diagnosed pain

Hi, before summer i started having awful pains in my abdomen. At first they thought it was gastrits, but then that medicine wasn't working they thought it was in my bowel. I've had an MRI and it came back saying a slightly thick wall in the joining of my small bowel and large bowel. I'm 16 years old, female, and other than this i am in good health. I have prelims in january and i am missing too much school! My doctor thinks it might be IBS because my blood test results say that i'm fine, but i know i'm not because i feel so sick constantly. My symptoms include severe pain in my abdomen, nausea, vomiting, headaches, depression, tingling and bad smelling urine. Any suggestions?

Do you have change of bowel habit and do you get relief of pain after a bowel movement.

No my bowel movements are fine and it doesnt change.

Have you been tested for h pylori and gallbladder?