Im feeling slow and like i cant retain new knoledge, can you help?

I went skiing last week, and i had a pretty bad accident and smacked my head on some ice. The next night we played beer pong, and ever since then ive felt really slow, almost like the things people are saying to me are in a forign language.

Can anyone tell me if this is a side effect of drinking with a concussion, and if there is some way to get my head back on straight?