I might die cuz i needa root c!?

about 3-4 weeks ago, my tooth hurt so i went to the dentist. my filling decayed so he took it out and gave me a new filling. it stopped hurting a week after, then hurt again for a week and if i chewed something alot, it wud beat like a heart. then it stopped hurting, and i bit a candy skittle in the shape of an m&m on friday and it hurt, and now it still does.. its on the left side of my mouth, and when i was walkin to the comp i felt this zing on the RIGHT of my head and it sorta hurt.. and it just zinged me a few mins ago and that hurt too.. its like ur vein .. hurting :S it feels like a line.. am i gunna die? cuz i heard it cud go up to ur brain and kill u