Can very high levels of VitB6 cause constant tingling and numbness in fingers and arms?

Not sure, but the cause could also be from pinching a nerve and generally is. Not all pinched nerves or problems with muscles give pain as an indicator. My experience is almost 95% pinched nerves. Easy test. Poke and prod your back, under your arm pits and shoulder blades around the "bra" line (sorry guys - you get the idea) or in the space above your hip and below your rib cage. If there is tenderness then probability of 100%.