different people are different, i've been doing live music, playing guitar for 12 years, and drums for ~3 years, my hearing is obviously not going to be as good as my brother, who has always had a stock system, and used to play bassball, a sport with no loud noises..
so your ears hurting might just be from you not being used to sound pressure.
i remember the first time i came across the RE XXX15 in a snailshell, i couldn't breathe, i had to get out of the car, it made me kind of feel sick.