Help! I'm taking percocet 5/325 for a root c, & I am so sick at my stomach & throwing up.?

I started off on Vicodin, but it did the same thing. I've eaten beforehand, & taken Pepto, Pepcid & Alka Seltzer. I don't want to call my Dentist again, because I don't want him to think I'm using excuses to get more pills (which I'm honestly not). Does anyone know what to do to get this stuff to not make me sick? I used to be able to take it years ago without any problems!