I know I am posting this a little late but hopefully you'll still get it.
Have you talked with a Rheumatologist about Behcet's? I am currently in the same boat you're in and was recently diagnosed with the possibility of having Crohn's and before that had an MRI to rule out MS.
I am pretty convinced that I myself have Behcet's becuase ALL yes ALL of the symptoms fit.
During the barium swallow x-ray, the doctor couldn't tell for certain if it was Crohn's or colitis but suggested that an inflammatory process is to blame.
Currently I am in diagnositic limbo. I am awaiting a CT enterography to help diagnose the Crohn's. If they cannot officially make the diagnoses for whatever reason my GI doc will probably refer me to a Rheumatologist or Neurologist.
GOOD LUCK!