I had an EMG before anyone suspected Fibro. My first symptom was numbness and tingling in my left arm. I was in my early 20's and once they ruled out a stroke the assumption was a pinched nerve. I went to physical therapy but did not get better and they insisted on xrays and MRIs before continuing treatment. The xrays and MRIs showed there was nothing wrong with my spine/collar and no pinched nerves. I then had the EMG.
The EMG was pretty normal. They saw muscle spasming in my neck but nothing beyond that. A few hours after the EMG the symptoms did begin to spread into my leg as well. The next step was a brain MRI which was normal as well. It was a few months later that the Fibro diagnosis came about once the pain was very noticable and present. I got all the other symptoms and associated conditions of Fibro before the pain came.
I also went through all the blood tests, for months and months. Every few weeks my Dr would think of more to test. I even went so far to have genetic testing done to rule out a few diseases. One of the biggest problems with Fibro is that all the tests will come back normal. Have they done the pressure test on the tender points? I think that is thed most telling test. No one flies off the table when they are touched in certain points unless they have Fibro.