@raellen they wait to do the first PET scan for I think it was 90 days to give the tumor time to shrink further. It keeps working after treatment is done. My life is pretty close to normal now with the exception that I have to wear a pad every day because of sphincter muscle being weak.
If I have a bout of diarrhea (SIBO) then I stay close to toilet or take lomotil if I cannot. Just don't go anywhere where there are no facilities. My was also 3A. it had metasasized to 2 lymph node which the radiation took care of. That was 2 years ago.