Does your town have A General Assistance fund/program https://www.maine.gov/dhhs/ofi/programs-services/general-assistance I don't know more than what I read on the website, but this seems like it could apply in your case. (Not sure if this is one of the rental assistance applications you've already tried.)

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Would you qualify for short-term disability through work? Can you get an advance on a paycheck? (Not sure if you worked between covid and surgery)

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Would you qualify for a bank loan?

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Do you have any friends or family who might give you a loan?

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Wish I had a great answer for you, but I don't.