My porcelain veneers affecting my bite, please tell me should I be worried?

I just got veneers on my two middle front teeth which look fine except a little whiter than my own teeth. My veneers are bulky at the back. I cannot chew properly. My back teeth do not meet on either side of my mouth. My dentist filed the veneers AFTER gluing them and when filing i felt sensitivity so he stopped and told me to wait for two days. The filing he has done is very rough and uneven and i am afraid he will weaken my actual teeth as he kept filing down unevenly to correct his mistake.