Brina... I have issues with my left hand and foot getting numb when I ride. If I'm careful to keep my shoulders relaxed and not lock my elbow, my hand doesn't get numb at all.

I don't know what guyon canal syndrome is, but it might be a good idea to talk to a physical therapist or a doctor. I'm fortunate to have a friend who is a PT and she helps me a lot. I hope you get it all sorted out soon!!