Bee Sting itching after a day? HELP PLEASE!?

I got stung by a bee yesterday morning and for the day it was fine i put benedryl on it at night and it was fine until about 1 in the morning and i started itching it practically all night. now its pretty swollen. is this itchiness normal? Is there anything else i could use to help it stop because i have a really important tennis match tomorrow and i would hate to have to withdraw :( i tried calamine lotion but it didn't help a lot so now i am icing it. Any other suggestions?