What is the treatment of erectile dysfunction secondary to psychological trauma due to a distressing sexual experience ?

See answer : Psychological factors are primarily responsible for about 10%-20% of all cases of erectile dysfunction (ED) and often a secondary reaction to an underlying physical cause as well. ED resulting from a "distressed sexual experience" may lead to performance anxiety and/or fear of repeated failure perpetuating the ED cycle. Treatment involves reassurance, psychological support or therapy, and ED drugs

Surface and depth: You could try behavioral approaches to address the sexual issue, basically systematic desensitization to reverse the conditioned response linking distress with erectile function. You could also work on a "deeper" level and come to terms with the distressing sexual experience. You could use a medication to address the physical problem, but the psychological issue may or may not go away if ignored

Sounds a little like: PTSD, but such a dx needs to be made by a sex therapist, or psychologist with experience with sexual trauma. ED, if all physical causes have been eliminated, is largely about anxiety, in your case probably about potentially emotionally revisiting the trauma, triggered by sexual stimuli. The tx is relaxation, sensate focus, and desensitization--standard tx's for anxiety, applied to sexuality.