What to expect with end-stage Parkinson's disease?

I am an only child caring for my father, age 90, and has had Parkinson's Disease for 10 years, but probably longer. He did well with it on C/L for many years, even after a stroke, which he fully recovered from. He also has CHF, T2 diabetes, and other issues. He did rely on a walker but lived alone for 7+ years until recently with just part-time caregivers. About 6 months ago, he started to decline rapdily. He told me his legs would freeze up when trying to walk and there were many times my husband and I had to go help him up off the floor. Then the falls started, just minor at first. I begged him to move to AL but he refused. Then one morning at end of May my caregiver found him on the floor, face down, not sure how long he'd been there but he'd had a serious fall. Trip to the ER, followed by surgery to fix a herniated disc, 2-week hospital stay then rehab, and now he's in long-term care at the skilled nursing facility where he did rehab. All doctors and PTs etc. say he cannot live alone, and he has no other family, he has outlived everyone - it's just me, his only child and my husband. I have a teen daughter and a job, so I cannot take on full-time care for him nor do I want to, so unfortunately long-term care is the only option. I am having to clean out his huge house of 45+ years on my own and sell it to pay for care. It's just been a lot the past month and a half, and I am overwhelmed and burnt out.

My dad now needs 2-person assist to get up and down, cannot walk but a few steps with assistance, can't dress himself, etc. He definitely has some cognitive decline happening as well, as he has had hospital delerium and now it seems that has stayed as he has periods of seeming totally lucid and fine, and then he's very confused and has delusions or thinks he's back working in management at his old corporate job. I had noticed some mild congitive changes a year prior to the fall - he fell for a phone scam and it was a living nightmare to get him to see he was being scammed and I was not the bad guy and it cost him $10K. Then he became more forgetful, missing meds sometimes, things like that, so I extended caregiver's hours to be there more often because he insisted on living alone and I was scared of a fall happening that would cause decline like this and that is what happened.

My dad's neuro was useless. We've been trying to get in with a new neuro that specializes in PD and we had an apt then I got Covid and couldn't take him, then boom, the fall happened. We do have an apt. in a couple of weeks with this new neuro, but I was wondering if others have been through something like this with an elderly person having fast decline after a fall/surgery type of event?

In addition to the mobility issues now, and the definite cognitive issues, my father has also lost around 27 lbs since this happened end of May. He is still eating but not much at all, he says he doesn't have much of an appetite. He sleeps much of the day and is very tired all the time. Twice he was found unresponsive at the SNF - the first time, they rushed him to ER and they ran a bunch of tests and found nothing. Second time it happend the doctor was there and realized it was due to low BP and it was happening when he was being helped up from lying/sitting to standing, he would pass out. They have adjusted his BP meds and that seems to have stopped the episodes. He also just had his first UTI that caused an increase in confusion and he is still being treated for that. With all of these things together, the loss of mobility, delusions, short-term memory issues, not eating much, weight loss, sleeping a lot, low BP blacking out episodes -- are all of these things signs of end-stage PD? I am just trying to prepare myself for what is coming, and also what to ask the new neuro about. I also wonder when I need to approach the subject of when to get a Hospice evaluation, I don't know if he is there yet.

Anyone else with a LO with PD that can help tell me about end stages?