I would let the department of health know and/or the board of nursing know of your concerns. You may actually be required to make a report to protect the residents as a "mandated reporter"
Many accidents in nursing homes are the direct result of understaffing.
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You can report anonymously to the Department of Health (or whatever Department in your State regulates Nursing Homes.) Some States have minimum requirements for staff caring for patients.
Your License may be jeopardized working under present understaffed circumstances.
You may also want to report to the Licensing Board of Nursing in your State.
Without knowing more details, there may be a cause of action for retaliation because the DON essentially "fired" you.
You are to be admired for standing up for the safety and rights of your patients.