For personal injury + wrongful termination + harassment + defamation, how much would it cost or would they take a percentage?

I was read a defamatory email with no basis and harassed by my principal to resign on the day of my father's funeral after having left him in another family member's care to return to my job and complete my caseload--- which I did. This triggered a major health episode and FMLA was then approved by OCPS beginning on the following day the harassment took place. The CTA got involved and the resignation was rescinded both by me (on the same day it was signed) as well as by the principal--- yet the school board processed the resignation anyway.