Metastasis and outlook - seeking advice

Hi all,

I posted a while ago on the "welcome" channel, but I'll try here too for some advice and an update on the situation.

My dad, who lives in Italy, has metastatic castration resistant prostate cancer, with extensive bone metastasis. He went through several rounds of different therapies, pretty much anything available to him and a couple of clinical trials too. I'm sure these all helped as the first metastasis were first identified in 2019 and he's been perfectly fine, living a normal very active life until this year. 

In January he had a serious car accident, he was lucky to survive it with only a few broken bones, but seen how he already had cancer lesions on his upper body, breaking a few ribs definitely didn't help. He slowly recovered but the pain never really went away, in fact it got worse and worse this summer until he struggled to move. At this point I was really afraid he had spinal cord compression, and to be honest I'm still not quite sure he definitely didn't have it, as it sounds exactly like he did (he says the doctors never told him it was SCC). Anyway, there definitely was some spinal cord damage from the amount of lesions - he finally was able to have an MRI and radiotherapy, but a mix between his symptoms and the side effects from the radiotherapy got him in hospital, practically unable to move.

Since then, he's been doing much better. They transferred him to a rehabilitation centre where he gets physiotherapy every day, he is on a wheelchair but he's slowly relearning how to walk. We all thought it was touch and go for a while there, but every day he makes progress, the physio is very happy, and aside from his movement issues he's not been in much pain and things seemed to be looking better. 

He wanted to do an experimental lutetium therapy, which he was initially referred for, but his bloods aren't "good" enough for that. It's clear the metastasis has reached the bone marrow so his blood cell count is a bit all over the place, he's also had some transfusions. 

This was a definite setback, and since then the only therapy he's had is hormone tablets. Again, he's not really in pain, he makes progress with walking, and he is fairly independent in going to the bathroom, etc, as well as doing anything he wants while sitting on the chair (including still working on his laptop).

Now I just had a call from my him and my mum, he's developed a strong headache and is having some issues moving his tongue (definitely affecting his speech). The doctor said it's likely a cancer lesion affecting a nerve at the back of his neck, so he'll be referred for another MRI and targeted radiotherapy to address that before it gets too bad. 

This whole ordeal is obviously really hard on my mother, and is very hard on me, especially as I'm following everything from afar, and I feel very disconnected from it. There isn't really an equivalent of Macmillan or similar in Italy, and there isn't much I can do from here. I'm so torn between staying here and adopting a "wait and see" approach, or just flying over there and be with them. It has all precipitated so quickly that I legitimately don't know how much time my dad has left. He very much is a fighter, keeps on saying he's got no intention of dying, but I'm scared and I don't know how this reflects the reality of the situation - when it always seems like it's one step forward, two steps back. 

Anyway, any advice people could have on outlook, considering the situation, would be very welcome.