I was going to suggest thoracic outlet syndrome (TOS) for many of your upper body symptoms... how clear was the cervical MRI?
I was thinking maybe you might have some extra cervical ribs due to having issues for so long..
Sometimes they are missed.. maybe another look at the images or a new one & x rays too if not recent. Or perhaps x ray alone will be fine just to double check..
Perhaps large bone/ligaments or structural anomalies in the collarbone shoulder areas?

As I was reading so much of what you wrote sounded like it could possibly be TOS of course others might see another condition... or more than a single condition...

Tested for Lyme, or no chance of that?? it has bizarre symptoms..

Here is our TOS forum useful sticky thread if you would like to read more about it to see if it fits.
http://neurotalk.psychcentral.com/thread84.html