The only thing I can think of is that, if a company is requiring a vaccine it is taking on all responsibility of medical liability.
I’d go see a lawyer in regards to the law, first. Second, make an appointment with the doctor and get your vitals officially recorded.
It will be evidence in court against the company for you or, which I hope not, your widow.
My wife thinks I should go the religious liberty route. But being a contractor, if I get sick, I have no recourse.