Doctors: What they know and don't know  

"dad had throat cancer and they cut his balls off and he was more frustrated than the rest of us"

I hope your dad dies peacefully in his sleep with no health problems. In my dad's case, it wasn't only the loss of certain things that was frustrating, but the frequent visits to his oncologist for the "let's see if this works!" treatments, some of which were very debilitating. It's bad enough for the patient, but the whole family ends up going through it with him/her. It's not fun for anyone. You sound like a real compassionate person. May you or a close family member never have to endure it.