The fear of having some non-professional try to "cure" me
is one of the reasons I never tell anyone about my emet. I
couldn't bear the paranoia, wondering if my drink was
tainted with some sick-inducer while I was in the bathroom,
or having sick people coming to stay with me for a surprise
visit. If I were you, I'd warn him that any "bright ideas"
to cure you himself will almost certainly just make the
phobia worse. If he can't understand the phobia, hopefully
he can understand that much.
'I am a sick man...I am a spiteful man. I am an unattractive man. I think my liver is diseased. Then again, I don't know a thing about my illness; I'm not even sure what hurts.'