Just another thought: I was having problems with numbness in my hands - turns out it was caused by my shoulders. As I singer I use music folders and holding them up to sing was causing muscle tightness in my shoulders which was translating to numbness in my hands. Now I try and get my shoulders massaged every so often to release the tension or when my hands start going numb again.
Let us know when the MRI is, and keeping you in my thougths.
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming: "Yeah Baby! What a Ride!"