Please Help!!!!!!!!!!?

Hi, the other night I tried cocaine for the first time, I did one line because some of my friends pressured me into it. I wasn't very informed about the side effects of the drug and admittedly i know it was a very very stupid decision. I then went on to a bar and I drank excessively, it has now been 4 days and I still feel as if i am in a fog, I feel like my cognitive skills are GREATLY diminished and i find that Im having trouble doing academic tasks. I am petrified that my night has resulted in permanent damage. If theres anyone out there with any information on the matter please please send me some feed back