boss attitude changed after fmla approval, rec’d final warning

r/

location: nj how difficult is this to prove?

working with this dept since 2021, first two annual reviews were excellent. have been employed with the company since 2007 but worked in a different department. previous dept was top employ, promoted to lead tech.

2023 went on intermittent fmla for mental health reasons. started to receive criticism & verbal warnings for performance, things are employees do but how to prove that? being targeted & don’t know how to prove it.

performance spiral now because of fear. any advice would be appreciated, please be respectful.