Where is your stent located? In the heart area or in your neck area of the artery?
may not matter but I was just wondering about the location.

#2 problem
the arm, neck pain could be from repetitive strain injuries {RSI} {tennis elbow type} or possibly thoracic outlet syndrome {TOS} {muscle spasms and triggerpoints in the neck, upper back, shoulders, sometimes even the chest}, cervical spine neck issues, or it could be any mix of things but these are what came to me from what you wrote.

We have a TOS forum where you can learn more and a subforum there for RSI.
http://neurotalk.psychcentral.com/forum24.html

Do you think everything is related or could it be a couple separate issues?