I know its very emotional for some to consider moving, but RN's are in demand almost everywhere. Surely there's a more stable opportunity out there to consider? I'm not sure how close or far you are to other options, but I would give it some thought.
My spouse is a F/T RN in a acute hospital setting and makes well over $120k/yr (with overtime) after practicing about 7 years (he changed careers in his late 20's) - and we're not in the highest paid RN market by any stretch because so many people want to live in our city (Austin TX). He has stayed within the same hospital system and worked his way up, but I've been impressed at how fast he's basically been able to 1.75x his base salary, which of course is amplified on any OT pay.
We do find the income is cyclical over the year. During the Fall/Winter months, the hospital is flooded with patients (flu, RSV, etc) and overtime/bonuses are free flowing. An actual example: yesterday my spouse was not scheduled but the hospital was desperate for RN's and offered bonus $ + OT for anyone who would come in. This worked out to functionally $100/hr offer - so he went in to happily accept it.
We stash a ton between Oct - March. In the Spring/Summer, fewer patients = less opportunities for overtime, no seasonal bonuses, even the possibility of not making FT hours/ getting sent home. We plan for this and usually schedule travel as a family during this period, tackle house projects, cash in extra PTO, etc.
While your current situation sounds stressful, the healthcare market is always in need and is expected to grow.