Llona,
I'm not in the same situation as your husband. I just stopped Casodex after taking it for 6 months to reduce my prostate size so I could have seed implants and IMRT, which I completeted 4 weeks ago. Casodex took my PSA from 30 to 0.02 in about 4 months.
The most effective protocol for HT now is ADT3, which is Lupron or equvilant, Casodex and Proscar for at least 24 months, then maintenance with Proscar which makes the psa rise more slowly givng you more off time between treatments.
Many have been on this treatment for years, so keep the hope up. Diet and supplements are also very important in slowing progression. Regular excercise is a must including weights.
A good book to read is "Beating Prostate Cancer: Hormone Therapy and Diet" by Dr Charles Snuffy Myers.
JohnT