You might want to reconsider.
I never did the first medical exam. I could never prove that I was healthy to begin with. Everything that happens as a result is my own problem.(and expense.)
Get that physical assessment done now.
In 20 years you will have it to fall back on. If you aren't working for the Government anymore it would be easy to file some sort of lawsuit to recoup for damages. -Lots of lawyers will start to drool if you bring this to them. Nothing better than a lawsuit against the Government. Huge settlements and great fees.
The time delay will make for lots of changes in the current "situation". And when you are older and you get a lawyer involved they are the "face" of the legal procedings, not you. They are required to not disclose who you are.
And you don't have to file in your own town even. You could start actions from anywhere. A federal case could be started in Alaska. The medical evidence showing the degeneration of your condition in ways consistent with those as outlined by the safety hazards documents is irrefutable. With the right documentation it would be an open & shut case that probably wouldn't even need to go to trial. Just one of those quiet settlements that nobody hears about.
But that's all conjecture...It's a worst case scenario.
There is a good chance things will never go that far.
But to keep your options open and cover yourself you might consider getting the exam anyways. Get copies of the results for yourself and forget about it until you need it if you ever do. Otherwise they are just a few pieces of paper in your files.
It's a case of little to lose, lots to gain.
Just my wary opinion.
-It looks like I might not suffer complete liver failure too. Just damaged and not working well. I can't afford to drink anyways.