In case you're thinking you're "too old" to leave and make another (better) life for yourself, I say this: you're too old NOT to. You won't be younger in a week, a month, a year. The sooner you make a plan (or, as my daddy used to say "hatch a plot"), the sooner you can live in peace and the longer you'll have to enjoy that peace.
If you're in good health and have kept up your nursing license, you can supplement your income with nursing gigs. The demand is high for private duty nurses, and it pays well. If you're in good health but haven't kept up your license, you can go back to school and pick up what you need to get it back. This is not to say that you should work full time, just that you
can work here and there as your pocketbook dictates. Heck, it wouldn't surprise me if a good divorce attorney can ask for and get an order for him to pay for the classes you need.
Arizona is a community property state. You're entitled to half the marital assets. Half. You won't be leaving with nothing. In addition, since you've been married for more than 10 years, if his SS is more than yours, yours will be recalculated so that you'll get the difference between what you get and what his amounts to. For instance, if your SS is $1500/month and his is $2000/month, after a divorce, yours will be $2000/month, and the amount he gets won't be affected. (Forgive me, I don't do numbers so just chose some nice round numbers, but you get the idea.) I believe that you can also ask for half his retirement if he gets a pension, but since I'm not an attorney and never played one on TV, a pension benefit is something for an attorney to sort out.
Please don't just dismiss out of hand the possibility of leaving because the devil you know is better than the devil you don't. Do your due diligence and then make a decision about whether you'll be better off with him or without him. This I can tell you without a doubt: your mental health will be far better off without him. What good is physical health if you're emotionally so distressed that you can't enjoy it?
Okay, now I'm going to go face the East for a moment of silent prayer on your behalf. Then I'm going to sit on the patio with my second cup of coffee.
One more thing: just for sh!ts and giggles, why not prepare today's dinner so that it's not keto-friendly, not gluten-free, not whatever is the dietary trend-of-the-moment and either make something that
you really like or something that's so disagreeable to her than she won't want to eat it at all? (Yes, I'm a beeyotch that way! LOL)
Okay, I lied about one more thing

Here's another thing. My 73-year-old sister is quite well off; she's a "retired" nurse but all the years since she retired, she's worked one day a month solely for the purpose of keeping her license active in case she ever needed it. She recently became a widow and told me that she's glad she kept her license so that she'll "have something to do and to look forward to."
Oops. Another thing! You haven't said whether you still have family and if you do, where they are? Might you want to move to be closer to them? Just a reminder that if you have family still in Michigan, don't forget how brutal the winters are. I'm a Yooper, and when I get really homesick and want to be where most of my brothers and sisters are, I have to do a reality check to remember how unforgiving, how long, and how truly nasty winter can be.