So sorry to hear this, and sorry to be late finding it. I know the vertigo thing is awful, as I have it due to an inner ear condition called meniere's disease. It s manageable but I hope that's not what you have. As for the hand, I had something similar a few years back, tried a few things and eventually took a month off playing, which was tough even for a crappy player like me. It did get better but I still get sore after frequent gigs and need time off and sometimes ice. Take care and receive all the good karma coming your way from friends and fans.