As said, doctors are VERY reluctant to give out such drugs
especially to younger people, primarily because of the potential for addiction
. I would of thought that faking pain isn't an easy thing to do without some actual experience of the pain that is going to be faked.
Of course it is possible to get a doctor that will prescribe these things fairly easy but the chances of getting such a doctor are low, and the chances of faking pain for the first time and successfully getting this kind of drug
is extremely low.