*giggles*
It's very, very funny. I love:
“It’s not paracetamol, John.”
“You have a halo.”
“Definitely not."
You really have a gift for dialogue.

There's just one flaw : Twenty minutes after John experienced the third effect of the pills and got Sherlock to help with the problem
This is not very clear. Be more specific, please. :D

It's hallucinations. Unless you want Sherlock to speak with a German accent. :D