Are a nerve conduction study and an EMG really necessary, given my symptoms and MRI test results, and why?

They are looking for blocked pathways of your nerves which might give rise to some of your symptoms. They could also tell if there is an inflammatory process in your nerves going on or in your muscles. Don't chicken out this time, get it done. Most people state this isn't that bad. It may finally give you the proper diagnosis that you have eluded for so long. And then, you could get the proper treatment that may make you feel more well.