Hi... I too thought Everton was a Brit
My Dad has metastatic PCa and (sometimes my signature appears.. sometimes not so will give brief overview) His psa rose dramatically over a period of around 6 months ...from 13... to.. 40... to 70 ... last psa result was 220. They didn't do anything immediately, they waited a good few months before starting him on Zytiga. I do question why they didn't start him on it earlier but I'm presuming they had their reasons... expense being one of them probably.
Have you been in touch with the Macmillan nurses? I'm guessing you have but just thought I'd mention it... they've been an absolute God send. My Dad struggles to get around at the moment (he has arthritis in his spine as well) they have provided so much to help with his mobility. Not sure if that's an issue for your husband but if you haven't been in touch with them, I highly recommend you do. They can offer support in so many ways.
My Dad seems to be doing well on the Zytiga, his next check up is in 2 weeks so we are hoping the psa has gone down.
Sorry I haven't offered much help, just an account of how my Dad's treatment went when his psa started to rise. Some of the more knowledgeable people will be able to offer more advice on the questions you should be asking. You're well informed on the treatments available so don't be afraid to ask about
each and every one.
Wishing you the very best. You sound really positive which is great, there are many treatments available and I hope that the next works well for your husband xx