Sell the rental.
You said you're tired - it's stealing your life energy, and you're not adequately factoring that worth into the equation. Once you get rid of that, see how your job affects you. If you're still tired after a few months, take the longest vacation you can and see if that helps.
Also, if you're tired, that might be because of health issues as well, so make sure that is ruled out. If you snore, look into getting tested for sleep apnea, for example.
At that point, you'll have a clear head and know where you stand.
I expect you'll want to try reducing your hours as much as your employer will let you at that point, which hopefully will be enough to make you feel better too.
yolfer did the math you should need, although I'd offer this tweak: you're nearing 60. Average life expectancy is early 80's, so maybe you can use a higher SWR. Your income there might be $25,000 there then. Play around with FIRECalc. Don't forget to add in the capital you'll have from your rental.
Sorry, I can't help on the health insurance - I live in Canada.