It takes an absolutely insane amount of energy to fight a huge company like this and even if you do everything right the chances are pretty good they'll wear you out first.
Best of luck with your recovery! It's been a really tough few years for me and I can't think of much to say except that I empathize with you and perhaps recommend this book [1] which looking back lists a lot of things that helped me get over it.
[1] https://www.goodreads.com/book/show/18693771-the-body-keeps-...
If you find a way to keep feeling safe, like I imagine having a good pro-bono legal advisor could have done for me, then by all means go ahead. If not, then there's also no shame in just moving on.
I thought the same; but like you was mistaken in that. Looking back I've come to realize that, even though it shouldn't be, as soon as you get HR involved it's become a legal issue.
But yeah; my point was that if solid legal backing could prevent you from developing the anxiety and depression, like I think it would have for me, then it could be worth going through with it...