I break down in tears at the drop of a hat...like now
This is perfectly understandable and reasonable. When it happens, just go with it.
I am also irritated by the perpetually upbeat attitude that seems to think that sheer will power can beat something like this. One of the reasons this bugs me is because if the patient experiences a setback, s/he can think it's because they weren't positive enough, that somehow they're being punished. Southern Girl's advice is very good!