Tony,
Over the years many people from the Neuromuscular forum at OBT..went through many of the "same " fears as you are having..but many came to realize they did not have ALS...some sought professional counseling...some had other "treatable " physical things going on...
You can look- up any symptom on the internet and it can fit almost anything..every headache is not a brain tumor..and every twitch is not ALS...self- diagnosing and second guessing your doctor is not a good idea...
My concern is even if you have an EMG...will it ease your mind? Or will you question that test as well ?
None of us here are docs, we can't see you,even if we could we are not qualiified to diagnos you...but everyone who has responded to this thread...has told you nothing you have mentioned "sounds" like ALS..
Please again consider seeking professional help for your anxiety problems...as living in constant fear...will destroy any happiness you have...let your doctors know how your "constant" fears are affecting your life...and see if they can refer you to a qualified counselor..Lisa