I have a huge round zit? please help?

i usually don't break out but occasionally i will get a couple zits the week before my period. it happens to be that week and i have a HUGE zit on my forehead RIGHT in between my eyebrows. i cant pop it because it doesn't have a white tip. its like a giant bubble. and it hurts when i touch it. i have tried everything( proactive refining mask, clean and clear zit zapper, tooth paste, etc.) i've been trying to get rid of it for 3 days and i will be having pictures taken tomorrow and i NEED something fast and effective. please help. thank you so much!