Ed,
Hate that you're playing the waiting game; I know how bad it sucks. I had my first (of three) EMG on Aug 1st and my appointment for the results wasn't until Aug 31st. I'll never do that again! Neuro said "I don't know what you have, but it isn't ALS." I celebrated for a week in FL with the family, came back and got a second opinion in October. Second neuro was more experienced with ALS and EMG. Did the test himself (head to toe, all limbs, back, cheek and tongue... I still hate that guy!). He read the results for about 20 minutes before he made the diagnosis. Confirmed a month later on my final EMG.
The point isn't that 'it could get worse', it's simply that these guys can be wrong. Make sure you demand the time that this testing/exam require, and if you're not satisfied consider a different doctor. He may be smart enough to be a neuro, but not all of them are created equal! You are your own best advocate for quality care, don't let yourself down!
The list of things this could be is long, complicated and bizarre; we're all hoping it's one of those obscure ailments. Like the North American tree frog enzyme or something stupid!