My advice would be... DONT USE DRUGS! I know someone that is close to me that almost loose his life because of it so I really don't consider the matter as a joke.
The next one would be, chillax. It's not like the world is falling or anything. At least you still have a good health and still have friends to hang out with. I haven't heard back to any school that I applied for the 1st round (decision due this Friday). But if I got rejected, so what? I can still apply to other school on the second round, or next year after I accumulate more experience - plus I hear that they look favorably on re-applicants, especially those that advance their career.
Go and hang out with your friend. I know that the GMAT preparations and essay writing is tedious especially on top of your day job. You deserve a break