Glad you’re okay. The vibration while braking might be your wheel is out of true, or damaged brakes, or something else. And the shifting could be as simple as a bent derailleur hanger, pretty easy fix! Hard to tell without seeing it. Definitely have the bike looked over by a mechanic, you might just need a few minor repairs and can keep riding it. New helmet 100% though!
Glad you’re okay. The vibration while braking might be your wheel is out of true, or damaged brakes, or something else. And the shifting could be as simple as a bent derailleur hanger, pretty easy fix! Hard to tell without seeing it. Definitely have the bike looked over by a mechanic, you might just need a few minor repairs and can keep riding it. New helmet 100% though!