Must be a shitty hospital. They should have given you some kind of benzo or anti-psychotic. Not to mention making you fill out paperwork, while a possible impending drug overdose is brewing. Sheesh I wouldn't go back to that hospital.
A 20X overdose is a poisoning. They should have administrated the charcoal immediately: (http://en.wikipedia.org/wiki/Activated_carbon). As it is, the charcoal may have saved his life!
Might I suggest to others to keep a bottle of activated charcoal around for such situations? If poisoning is suspected, take it as soon as possible because it works best when the compound hasn't been fully absorbed in the gut. Make sure to use the raw powder; no capsules!