I wanted some advice before heading off to see a doctor. I'm right handed and play electric right handed. Just over the past few weeks, I've noticed that after playing for over 30 minutes-ish at a stretch, my left (fretting) hand starts to tingle. It's like a "falling asleep" feeling. A tingling numbness that starts to get painful. It starts at my hand and crawls up my forearm at which point I usually stop playing for a while, shake my hand out and wait a while for it to go away before playing again. I've tried stretching, different strap positions, different neck angles, and even sitting and standing, but it's still happening. Anyone have any experiences like this or any advice/suggestions?