As a wise taxi driver once said to me "It's not your Daddy's company." Fuck them. Do you really think that people are going to say "There's Stan. He was on a PiP, but now he's straightened out and flying right." Of course they aren't -- these are the narcissistic bullying types which put you in this position in the first place. Nobody likes drama, except these louses of people who foist it on innocent, well-meaning types like you. Engaging with this drama will drain your self-esteem. They have already got you in such a spin you are asking randoms on this site for help. Disengage quietly, and don't feed the beast.
A PiP is a tool used so that they can fire you "with cause" to reduce their liability.
Good luck, and remember: fuck 'em.