Hi Terry,
I also took Amifostine injections and only missed two of thirty treatments because of low blood pressure. The injections do smart some, but the good thing is it puts you on the clock in relation to the machine. There is only a small window of time in which the drug is effective so the folks running the machine have ensure you receive your radiation treatment within that time frame -- it sure minimized the waiting time.
I'm over eight months post-treatment now and while I'm not completely dry, I don't have as much syliva as I had hoped. The docs tell me it could take up to two years before I get all I'm going to get. Either way, I'm glad I did it as I wanted to be proactive and do everything possible to mitigate the side effects of treatment.
Best of luck...
-Brett