The answer to your question is "it depends". Dose, body part, interval between doses, environmental exposure and so on. I am attaching an article that I read before starting my IMRT as primary treatment. It is lengthy and somewhat technical but it will give you some understanding of the effects.
David, I surely hope that things turn around for you. I read your posts frequently although I do not post comments often.
PS. I am not sure I got the whole address in but try a Google search with this much and it should take you to the PDF.
Diagnosed 04/10/08 Age 58 at the time
Gleason 4 + 3
DRE palpable tumor on left side
100% of 12 cores positive for PCa range 35% to 85%
Bone scan clear and chest x ray clear
CT scan shows potential lymph node involvement in pelvic region
Started Casodex on May 2 and stopped on June 1, 2008
Lupron injection on May 15 and every four months for next two years
Started IMRT/IGRT on July 10, 2008. 45 treatments scheduled
First 25 to be full pelvic for a total dose of 45 Gray to lymph nodes.
Last 20 to prostate only. Total dose to prostate 81 Gray.
Completed IMRT/IGRT 09/11/08.
PSA 02/08 21.5 at diagnosis
PSA 07/08 .82 after 8 wks of hormones
PSA 10/08 .642 one month after completion of IMRT, 6 months hormone
PSA 03/09 .38 six months post radiation and nine months into hormones
PSA 06/09 .36 or .30 depending on who did the test