I was sorry to hear that you are both struggling to see the point of the Docetaxel. I can only outline my own experience on this drug, which may help you to decide
I had 6 cycles of palliative Docetaxel, starting at the end of October 2017 and completing in February 2018. Yes, the side effects were horrible. All I wanted to do was sleep. And I mean sleep! I could quite happily have just slept away about two weeks solid. I also got other varied side effects as well. I remember one which particularly worried me was one morning I woke up feeling that someone had pushed half a house brick down my throat. My throat was so very sore, I had never felt anything like it. Luckily that only happened once.
But after six cycles, my oncologist decided I had had enough and he stopped it, saying the toxicity was beginning to outweigh the benefits. Other than continuing with Decapeptyl hormone treatment, I have not had other treatment since finishing the chemo.
For a couple of weeks after finishing the chemo, I still felt quite rough. I thought of it as a "chemo hangover". But eventually, this passed and I began to feel much better than I had felt at any time since being diagnosed.
I had a CT scan towards the end of April and they showed that all of my existing tumours were stable and there were no new tumours developing, but my PSA has risen from 23 to 53 since stopping the chemo.
So on the whole, I think persisting with the chemo was the right thing to do. It clearly halted progression at least for a while and as I said, I do feel so much better.
I hope this helps. We are all different and all can be affected differently, but I think it is worth carrying on with the treatment for a while longer. It will get better, so don't book that one way ticket just yet.
All the best to you
Peter