FIL with frontotemporal dementia and out-of-control anxiety and behaviors. Any advice?

My husband and I are caring for my FIL with frontotemporal dementia. He was diagnosed last year, but we know he was suffering from this for years pre-diagnosis.

We helped my MIL and FIL for six years in their home between my MIL's first stroke and when she passed away. We didn't live with them, but we did stay with them for extended periods during my MIL's many hospitalizations and surgeries. She passed away in 2017, and without her masking my FIL's behavior he grew to become out of control. It got so bad his longtime neighbors were hiding from him and pretending they weren't home when he'd knock on their doors.

He's been in 5 facilities in 10 months, he's been kicked out of 4 facilities for his behavior, such as aggression, violence, sexual assault of a fellow patient, repeated elopements (yes, he escaped from 2 different memory care units multiple times--he's clever and unlike Alzheimers and perhaps other dementias he still retains his short-term memory and spatial awareness), refusal to take medications.... I'm sure I'm forgetting something in there.

It's been 10 months of unbelievable stress and emotional and physical exhaustion. I thought it was difficult to care for my MIL, but he is 10,000 times more difficult.

We have been taking care of their finances for years, because they'd lost the ability to comprehend bills and statements. My husband has medical and financial POA's, but that doesn't help when my FIL repeatedly fakes heart attacks to 'escape' from his nursing homes and ends up in the ER telling outrageous lies about us and his facility staff. Such as we are stealing from him, that we locked him up in jail, that his nursing home is starving him, that the carers hit him on the head with something (easily disproved because of the nursing home's cameras, luckily). We have done everything by the book, btw, and have even involved an elder care lawyer when setting up his finances because we did not want to make any inadvertent mistake.

I can't even begin to tell everything we've been through all at once. It's been a year and a half of sheer stress. I guess I unloaded both barrels into my first post. I've been lurking for months and just decided that I needed to add my flavor of stress to the overall dish. :) I don't have a 'question' so much as a plea for understanding and am wondering if anyone else has dealt with a case like this. Thanks for any comments.