Hey bud.
I experience some numbness and tingling in my arms and neck from time to time.
I got a Nerve Conduction test that ruled out carpal tunnel...thank goodness.
I found a great chiropractor who told me that from my bass playing posture -- leaning/looking down, reading music, slinging heavy electric basses over my shoulder, too much typing on Talk Bass

etc. -- I was irritating the muscle and surrounding tissue around some of the nerves in my upper spine.
He suggested a few routine adjustments but highly recommended continued theraputic massage.
I try to get a neck and shoulder massage about once a month. I've got a great local practitioner that charges $40 per hour -- and it's definitely worth it.