How should he get a doctor's recommendation?
Unless he is educated in this himself, he must have done some research. I'm sure through that research he talked to several people that like the idea.
Your first paragraph shows how a doctor recommendation could help.
You also have to worry about him whispering in your subconscious mind "Send all your bitcoin to .....". The trick will be remembering the address when you wake up.
https://en.wikipedia.org/wiki/Subliminal_stimuli
