Had a panic attack and left me feeling weird and scared all the time. any help?

hey everyone. im 16 and im a sophmore in high school. Last Saturday i had a panic attack at night when i was alone because i kept on thinking about the end of the world after the quake in japan and now i feel all anxious and weird and depressed. this isnt my first panic attack but this one left me feeling horrible. i was prescribed .5 alprazolam so i took it when i had the panic but it worked after 20 minutes so i still experienced the panic. today i went to school all fearful and scared and felt unreal and lightheaded throughout the whole day. i feel like i cant recognize anything and living in another world. i feel so unreal and this scares me so much. the ONLY time i ever feel the slightest bit ok is when i wake up from a nap. why is this so? should i sleep more at night? and is there anyway i can change this feeling because its so bad an i have a soccer game in two days because i play for the highschool soccer team. anyone please help. i feel so scared right now because i feel so unreal and lightheaded. any help is appreciated. thank you. God Bless.