Sometimes a physiatrist is great, sometimes you need an anesthesiology-trained doc. I have both, working together in my group. Love them both!
My physiatrist is more like a rheumatologist, doesn't work on thoracic or cervical issues. My anesthesia-trained pain doc works anywhere, but doesn't do the nerve studies. He's great on neck injections, which should never be done by a physiatrist. Both can do lumbar injections. Thoracic injections or procedures need to be done in an OR, by the anesthesiologist, because of the danger of hitting a lung.
My general surgaon does all my (way to many needed) abdominal surgeries, colostomies, scopes. You could also see an internal medicine specialist or a gastroenterologist, or all of them. It's OK to ask for a second opinion! I've done it a few times!! I avoided (refused) having a foot of sigmoid colon removed, and that was probably why I later needed at least 3 more surgeries for my diverticulae (diverticulum, plural). (see also diverticulitis) I asked for just draining the infection. Not the greatest idea, only because it worked fine for my brother. Should have gotten a second opinion from a better surgeon. This guy had hams for hands, so I was turned off, scared. It would have been open surgery. My later surgeon did it laparoscopically - a MUCH better choice!
Get a second opinion!