Fern ,you can have vascular TOS and that have neurogenic involvement.

I had inconclusive EMGs too, four of them, I think. I had elbows, wrists, thumbs & shoulders too.

My good TOS expericenced Dr. Atasoy says all that is a result of the ribs, bracial plexus and scalenes being compressed. That's how he knows I've got TOS. I also have a band-thing between my deltoid and bicep muscle that used to go down to my elbow. Very painful, wilting to say the least. He says if I'd let him do surgery that would go away. he never diagnosed me with carpal tunnel, tennis elbow or shoulder anything, nor tendonitis. TOS related symptoms...

Also "palms up" helped relieve my arms discomfort. Have you see the Human Atlas at a doctor's office or PT, where the standing body has outstretched palms facing you and the toes are pointed straight out? That's the best alignment/posture for TOS I've found, standing or laying.

One the other forum I also noticed where someone used the "Miracle Balls." I swear by them babies too.

LED and infrared lightz gave me new life.

Take care and keep researching.