He rather sounds like an entitled douche.
He "at one point fearing he'd never play guitar again", which is to say, he got better, and will in be able to play, despite his baseless fears.
He's managed to get both vaccine doses, now giving him afaik 0 chance of dying to covid, and is complaining about the side effects, while billions of people around the world still have no vaccine, and 10000+ people per day are still dying.
Total "poor me" case.
Google: "Can a vaccinated person die of Covid?" and see what comes up. I get numerous examples of fully vaccinated people who have died of Covid.