messed up my knee...help!!

[97CivicBoy]

yeh so i was playing basketball tonite...went in jump stopped and my knee gave out on me and like popped out and then back in...i screamed and fell to the ground...i thought i was one...i was able to get up with soem help...and was walking around....it hurts a bit now..damn trainer and wellness center are closed already...barely have any ice took some advil..any one hurt there knee here....could this be serious..i cant put too much weight on my knee...lemme kno..u were the only guys i can turn to at this hour..thanx