As soon as possible, get a second opinion from the best hepatobiliary specialist you can find. Pancreatic disease is EXTREMELY difficult to treat correctly, so you need someone who knows what he/she is doing. I nearly died from pancreatitis 3 years ago, and it was sheer dumb luck that the best specialist in 3 states just happens to be affiliated at the hospital whose ER I was taken to. I got jerked around in the ER for nearly a full day before he was called in to consult, but he saved my life by operating immediately. (And later told me that he hadn't been very optimistic; he had put my survival odds at 1 in 10.)
BTW, an x-ray is not the normal diagnostic tool for pancreatic problems; the standard first option is ultrasound, followed by a CAT scan to determine the details. To give you an idea, I had 3 CAT scans in 7 days when I was in the acute phase of my treatment, and a total of 9 over 2 months while my recovery was being assessed.
Pain originating in the pancreas radiates to the back; that is classic., and it is some of the most excruciating pain the body can produce. (It's right up there with back labor.) There is only one kind of painkiller that is strong enough to tamp down pancreatic pain: opiates (and preferably intravenous opiates, because they are much better tolerated than the oral versions.)
This is not something that you want to waste time waiting around on; be as proactive as you can be, and make sure that he is getting the most expert treatment that you can find. I wish you both the best.