Had veneers put on top 4 front teeth. One tooth hurts to eat on it.

It sounds as if your veneers need some adjusting. This should stop the discomfort and and the contact with your lower teeth.I would call your dentist asap so you don't chip one of the new restorations.

Porcelain veneers should not hurt. Your discomfort could be due to proximity to the nerve, or a bite (occlusion) issue. You need to have xrays post op done on the veneers for evaluation, and your bite checked. If it is due to bite, a simple adjustment will take care of it, if it is due to nerve, even after the adjustment, the discomfort can continue, in which case possibility of endodontic dental treatment exists.

It sounds like your bite is off. Have your dentist adjust your bite. That should help. Good luck.