Terrible bleeding and inflammation from 6 veneers. What can be causing this?

In this type of case, a series of situations may be happening, all related to the gums.
When the gum limit is passed with the material of the veneers or with the cement, this may occur.
you should go to your doctor again or a second opinion.

Hi:There could be multiple reasons for inflamation of the gums.  It is difficult to know without xrays, and clinical exam.  On easy solution that you might want to try is to rinse your mouth with Lumineux Oral Essentials Clean and Fresh mouthwash twice a day to see if the bleeding and inflamation goes away.Best,Dr. Maddahi

There are  number of reasons why your gums are bleeding. That's a sign of inflammation and it needs to be addressed. Talk to your dentist about it and if you're not happy with his/her thoughts I would get a 2nd opinion.