Many have tried to emulate a possum in the ER, but it rarely works out. For one thing, most people who take this route are supremely bad actors. For another, TV doesn't really clearly depict this type of scenario; actual unconsciousness is a bit more complicated than the individual of sub-par attention-seeking intelligence is able to muster. Finally, faking seizures does not entail grabbing onto the side rails of the gurney and shaking them while moaning loudly and whipping your hair like Cher.
Thanks for playing possum, but your interpretation is an EPIC FAIL.
It will also not get you any narcotics.