Wow either you have been doing cocaine for a long time and have a high tolerance, or must be getting some real bad coke if you do 2 grams that fast. That is very dangerous in higher levels of purity of cocaine especially done in that short of a purity of time, possibility of overdose but thats with the GOOD coke.
Anyways i'm not here to try and figure out the quality of your coke but normally i'd recommend having a few shots, (mixed drink), a few beers, or some wine (whatever your preference of alcohol) BUT you consumed 2 grams of cocaine which is already a loot, and alcohol mixed with cocaine in the system puts more pressure on your organs including your heart, and although it's relatively uncommon/unheard of people oding from mixing coke and alcohol, it can easily happen but again usually this is a concern with a high amount of GOOD coke.
So forget the alcohol just to be safe, take any benzos if you have, any LOW dose opiates, if you don't have anything else like that, then try some nyquil from the store. Good luck. I could always fall asleep after GOOD coke, it would eventually make me so mellow and numb that i'd pass out from doing too much at once, but never ever even close to 2 grams. Good luck. XD