Hi OTMF and welcome to the Board!
I'll add a couple of points to what Baptista and Allen have already said. Medical oncologists have told us that the first round of docetaxel chemo for prostate cancer is usually quite tolerable for the patient, often without the physical effects usually associated with chemo. My impression from the talks was that nausea is usually not a substantial issue early on.
I'm wondering if your dad is getting the powerful bisphosphonate Zometa for maintaining bone mineral density and for help in coutering bone mets. It has been known to roll back bone mets in some men. Infrequently, patients develop a serious side effect known as ONJ (osteonecrosis of the jaw); there are preventive steps and corrective measures, but at times the injury is hard to bear.
I wish you well with your own case too.