Boss wants me to come back and I'm not so sure

My boss emailed me asking me when I am returning to work. Almost everyone was furloughed in March due to COVID-19 and I have been on an extended leave for medical issues. Now that she is asking me when I plan to return, I don't know what to say.

I don't want to return and deal with the same treatment as before. I was absolutely miserable. Is now an appropriate time to negotiate? Can I ask for a different position or a raise before coming back?

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