Re: Need advise/Retire or stay
I would ask to limit myself to one full time position( 5 eight hour shifts), and stick to it- like Cinderella, leave when your shift is over.
If you have sick days coming to you, use them when you dont feel 100% up to working.
I would do my work methodically, not pressured to ensure fewer mistakes, and if someone complains, say that it is important to do the job right and not be hurried. What you dont finish at the end of the day, tell your boss with a warm smile, I have to go, I will be happy to finish this tomorrow.
I would also consult with a lawyer, I hope this isn't a case of trying to fire you and not paying you your pension or whatever.
The important thing is work pleasantly, calmly, at your own pace, dont quit so close to the finish line - mistakes are human and I dont think she can fire you unless it was serious enough to affect pt care or worse.
Dont start looking for another job at this stage of the game, it will be riddled with more problems. the grass is not greener...
You sound like an amazing nurse who really cares, you put so much into your career (and you dont have to live at the facility like your DON, she should get a life!!) finish it respectfully,
Good Luck
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Life is too short, I wish you the best 
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