I have been through a nearly identical situation. I ultimately decided I did not want to work with people whom I believed were clearly discriminating against me, on the basis of my illness even if I could save my job. Just wasn't a pro-recovery environment for me. Not healthy. So I left. Def the right decision for me. Do consider what it might be like if you contest this and win and stay. It might not be very pleasant for you. Sending you positive vibes and support.