Originally Posted by morituri

Find a counselor who specializes in treating victims of infidelity and PTSD. I was given the name and phone number by a life saving friend of mine, and it helped me tremendously on my road to recovery.

While the following articles are no substitute for a good therapist, they can help nevertheless.

3 Ways to Erase Post-Affair Anger
Cheated On, Tortured by Images
Feeding the Affair-Image Beast
Erase Obsessive Affair Images (in 30 Minutes)