You all saw Monday night.
Now maybe its unrelated. But maybe its not. I cannot accurately put odds on that; nobody can at this point so any such attempt is a guess.
Fine.
How many of you are are marginal players? You know, you got signed but you're not superstars. You know it too. I know, everyone puffs their chest, but if you got a lower-end deal or were a not-so-first round draft you know that's what happened.
Spend $1,000 of your own money and no, not any team-approved or affiliated NFL doc either. Pay a qualified independent cardiac specialist.
Go get a troponin test and a cardiac MRI looking specifically for LGE.
If you come positive for damage on either or both go get a lawyer to tell your club to either fork up the entirety of your contract balance, in cash, right now and release you from all further obligation or you're going to sue the living crap out of both the club and the NFL for coercing you to do what you have every reason to believe caused that condition and which makes you unfit to play.
Remember, in civil court you only need to prove "more likely than not" and the jury pool all saw the thud Monday night on national television just like you did.
If you find nothing, you find nothing. That's good news, right? Nobody wants to thud on the field -- or in their house.
You have the money and for you, its not a lot of money.
Tell nobody until you have the tests run; if they're negative consider it a moderate night out on the town that reassured you that you're no more likely to die of the suddenly than any random person who is walking down the street.
You do want to know, right?
It's not very expensive to find out.