Thanks for the reassurance.
I was discussing the whole pain issue with my physical therapist, and he said that "pain" is such a tough term, since it can mean so many different things. For me, I associate it with...you know, actual, real pain, similar to what you describe with your dad. But, logically, aching, feeling "weird", or anything like that can also be pain symptoms, just less severe.
I haven't had a scan, so I have no idea if there are any tears or not. Obviously not a complete one. Apparently my strength difference is only about 20% between the arms. Still,
Yes, EMGs are incredibly sensitive. And also, I've read many places that with weakness, often times a person will not even know they have it, until it's pointed out on a clinical exam. My neurologist once said that not one of the people he's seen who come in actually worried about MND had it. I hope that's me too!