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.
helliott in Hamilton
Guitars -- 2 PRS CE 24s 85/15 pups, PRS semi-hollow CE 22, Fender Baja Telecaster; Gibson Les Paul Standard; 80s Strat updated with custom 69 pups, Anniversary Strat with Fat 50s, Epiphone Sheraton re-issue; Yamaha 5-string bass; Yamaha TBS 6 and 12 string acoustics,Takamine acoustic, Fender nylon string acoustic
Amps -- Mesa Boogie Lone Star; Boss Katana 100, Peavey Blueamaster 2x10, Line 6 Helix
Pedals etc: Mosfet Full Drive 2; Ibanez Tube Screamer; Fairfield Barbershop OD, Diamond Compressor; Voodo Sparkledrive, Boss Digital Delay DD7; Boss TU2 Chromatic Tuner; Cry Baby wah