I took 15 allergy pills an hour ago.. will i die?

I don't know which: Allergy pills you took or the dosage. Since you took an overdose i would encourage you to have a friend or family member transport you to the nearest er. Or if you are feeling quite ill then would encourage you to call 911.

Very unlikely BUT...: Since i don't know what kind please call poison control at 1-800-222-1222. I don't know any allergy pills that are likely to cause a fatal overdose at that dose but the important question is why you took 15 pills. Were you hoping to die? Please see a psychiatrist or counselor as soon as possible for counseling around the issues that inspired you to take 15 allergy pills.