Have you also had full blood work up?
Thyroid imbalances can sometimes play a part in symptoms.

Have you seen the TOS testing thread ?
It gives a good overview of many of the tests that can be used if needed.
http://neurotalk.psychcentral.com/post580952-11.html

I had quite a bit of buzzing and weird feelings inside my forearm muscles for a few months.


Are symptoms only in your arms , or do you have some neck tightness/stiffness along with the arm sensations?
Any fine/detail finger coordination losses?