Id do bandb for garage work if poss, but some places may let you stay.
If I was in your situation and it has become unbearable I would leave anyway I could and the sooner the better, there must be somewhere to go in this day and age.
Erm.... not so simple nowadays, I think, Kev? And the housing crisis is very real. It's not easy to find half-decent accommodation that's affordable for a start. In fact, "affordable" is pretty much an obsolete word for any available housing these days, good or bad! Unless you're reasonably well off to start with. That's why a lot of people are turning to living in a van as an alternative.
And don't forget (I never will!

) we no longer have free & easy passage round Europe any more, which used to be the go-to winter place - especially Spain! - for pensioners of all budgets, particularly minimal State Pension. Cheap accommodation all through the winter months and no high heating bills to contend with.
Having said that (all negative - sorry, but it's the truth

), if a holiday might help then maybe that's something to consider? Gives SaddleTank a break and some head space? But even organising something like that to begin with needs time, energy and determination, and if you're living with someone with schizophrenia that's easier said than done. Plus we don't know what their relationship to the OP is, which will have a big bearing on what they might decide to do?
Respite care for the OP would be a start, but I'm prepared to bet everything I own that it's nigh on impossible to get something like that sorted nowadays - unless you're lucky enough to have plenty of dosh to hand over to private care companies, and I'm willing to bet even more that there's a massive shortage of places available, private or otherwise!