what is a roofie?and what does it do to the body?

[Basher85]

So, I went out with a bunch of my friends last night and we started drinking after the 2nd drink a friend of mine hands me a drink. So, i drank it obv not thinking anything about it but after that drink i had to leave and meet up with some other friends. After that it's been a huge blur. supposedly i took a cap from one place to the other which i don't remember at all. Then inside the club i was in and out of conciousness. I threw up more than six times and still after almost 24hrs still dont feel good. I called my frined and asked him if he put anything in my drink and he joked around about putting a roofie in my drink and then denied it. What am i suppose to do how can i find out if it was a roofie or not.