I was treated very poorly by a WC doctor several years ago when I had a knee injury. I had fallen at work and landed on my knee on a concrete floor, the MRI didn't show anything conclusive, but I was in so much pain I could barely walk enough to go grocery shopping. The doctor came in after the MRI and said to me that I must just be being too sensitive about it, there's nothing wrong, and to get over it. I discovered after that that in my state the law forces WC to allow me one change of doctor at my own request, they'll give a few suggestions and I would pick one. One of the suggestions on the list was a doctor from the clinics that are most widely accepted as the best in the valley here and I sprung on him. A laproscopic surgery to find that there was some bone damage and clean it up and a few weeks later and I was pain free.

Anyway, my point is that I think that the WC doctors that everyone gets sent to first are intentionally dense, insensitive, uncaring, unfeeling pricks. I would find out if you are allowed a change of doctors and do so, even if there are hoops to jump through and it will take time. In the meantime, if they're paying for it and it's non-invasive I see no reason not to let them pay for a completely useless and inconclusive test. They're the ones that sent you to the moron doctor. I'd also go ahead and let your PCP treat you with meds, if he's knowledgeable and caring, in the meantime. There is no reason to suffer while waiting for a new doc.