yeah i think you have the flu.
drink A LOT of fluids. water, juice. but not orange juice. it might burn your throat from the acid.
lay in bed. don't do anything too hard. you'll get better faster if you just rest and watch tv or something.
lay with a blanket so you can use it when u get cold and push it off when u get hot.
if you have a nintendo ds or something like that (game boy etc.) play that while you lay in bed. you won't get bored, and it will take your mind off all your aches and pains. if you aren't thinking about it, they aren't so bad!
i hope you feel better and happy birthday!