Can I be demoted and relocated if asking to go on medical leave for heart failure?

Question Details: I gave 2 weeks notice to either go on medical leave or quit. Within 2 hours of submitting this notice, after my replacement had been notified and secured, I was told that I was being demoted from store manager to assistant manager and was being transferred to a store an hour and a half away. When the store manager of the other store called me to put me on her schedule, she said the position my district manager approved was that of cashier, even lower than originally offered. And this was all before I had even been given any medical leave. My district manager told me i was a phenomenal store manager and she had no complaints about my work, however she could not let me go because that would make her lose her bonus. Am I also losing my mind on top of being in heart failure or is this completely illegal?

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