Doesn't true carpal tunnel only affect the hands??

If it is affecting arms also you might want to explore our thoracic outlet syndrome forum TOS for short.
TOS is not well known or understood by many drs, some advanced PTs usually know more about it..

Do you do repetitive activities? forward head/shoulders or hunched postures?
Here is the useful stick link for TOS post #1 is a crash course.
http://neurotalk.psychcentral.com/thread84.html

There is also what is called double or triple crush with TOS, you have TOS plus cubital and/ or carpal tunnel.

But search the symptoms of carpal tunnel and make sure they really do fit for you before getting any surgery - and try PT first.

It could be TOS causing the issues if symptoms are up the arms- and if tight /sore neck, achy upper back are happening too.