I came down with shingles about a month ago but was fortunate to have a very mild case. I had the vaccine several years ago and that reduced the severity of my case. Try Sarna lotion for the itching. It is a little pricey but works well. Shingles can be very painful and debilitating until it runs its course. I have no idea how this would impact a clinical trial. Your husband simply may not be up to doing anything until he gets over this. I hope he has a very mild case.
Dx 2/2008, at age 71, PSA 9.1, G8, T1c
daVinci surgery 5/2008, G8(5+3), pT2c,N0,MX,R0
BCR 2 1/2 yrs after surgery
IMRT, 68.4 Gy, 12/2010 - 2/2011
PSA 0.07 three months after IMRT