Oh boy, you ARE in between a rock and a hard place. The next specialist you need to add to the list is a Pain Management physician. After 5 years, you need some specialized assistance in that area since it doesn't appear to be going away any time soon. It will also add one more voice to your disability claim.
Two, gather ever scrap of written records from every doctor you have seen for the pancreatitis and anything else dealing with your abdomen. In order for your claim to go through, you MUST have written documentation. Simple as that.
Three, get a copy of the full-text version of your short-term and long-term disability policies (unless were talking Social Security Disability here). Why? Because...
Four, hire an attorney to work your disability claim for you. Just like SSD, insurance company, or anything else in life, you need written documentation in order for an attorney to do the best job possible on your behalf. An attorney will need to scrutinize the fine print of the policy.
You're in for not only a fight for your health here, but a fight for your financial existence. I hope and pray you don't ever take NO for an answer and can hire the right people to do the job.