I was given z pak for my sinus infection,after the 3rd day just b...

I was given z pak for my sinus infection,after the 3rd day just before my last dose i started getting a sore throat. I thought it was just dry. The next day it was worse & over the next 3 days got so bad i coulkdnt eat & my ear hurt so bad i thought i had an ear infection.Well i went back to the dr. I now have sores in my throat on the left side way in back,like canker sores & they hurt .I never have had anything like it before. I was not having any throat problems till i took z pak not i dont know what's going on it's weird.I dont think i'll take it again.