Sorry you're going through all this added stress. Were you going to qualify for short term disability at work?
Do you work in an "at will" state?
I'd talk to a lawyer to get info, but think hard before going forward with a lawsuit.
At this point you can still move forward with another employer in the future.
I work in Home Health care. There are lots of positions for RN's that are not patient care. We have RNs that do intake, QA, paperwork jobs with low stress.
Don't give up on that RN degree yet. You're experience and degree are very valuable in today's work place. We hire people in their mid-age and older all the time.
In our area there's a nursing shortage and RN's can bargain easily for what they will and won't do.
I will be praying for you.
(Also, check with you're MD. At 55 you could be menopausal which can make the BP extreme.)
I'll pray for you.