Explain Chronic Pain which "shouldn't be"

 I have Crohn's Disease, and have had two surgeries in the past for it. For the past year I have been suffering from chronic pain in my abdomen, and the docs I see cannot see a 'flair up' of the Crohn's. I have finally been referred to pain management, but I recently had to move and start over with doctors. And once again, no one believes me that I'm in excrutiating pain, with 'no cause'. My Pain Management doctor suggested neuropathic pain, but was unable to diagnose it before I relocated. How can I get doctors to believe I am in so much pain when most Crohn's patients are fine with normal treatments? I have tried them all, still no flair ups, but still horrible pain.

Thank you.