I am 77 years of age and have a sex problem.?

I have had radiotherapy treatment for prostate cancer,and because of this I can no longer,to be crude,get it up or orgasm.I wish to eradicate my sex drive completely as I am very frustrated with my position.Can anyone suggest a course of treatment,PLEASE?When I was in the Army on basic training we had bromide in our tea.Where can I buy this as the chemist does not stock it.