I have to say I agree with most everyone here, a lawsuit would just be taking you backwards again, in a way. I undersatnd why you might want to, but to you really want to live it all over again, for what?
I feel like if I did sue the company (and win) that I'd have validation
The only validation you need comes for within, God and your loved ones. Not from the courts, and certainly not from that Biz.

You know you are a good employee, you said it yourself, they just "MADE" you feel like a bad employee, but you know they
where wrong, you are the best

The reward is not in the money you get from a lawsuit, the reward come from not letting then get to you, in being the best you can be and not letting jerks like them effect you. Your reward will come by being the best at what you are doing now, move forward with that, hold your head up high and know you are better then them.

Just my 2cents.