How Can PTSD Be Managed?

I have a medical diagnosis of ptsd from trauma during 12yrs married to alcoholic, it was verbal, emotional, mental abuse. I just experienced an episode, have had them before and familiar with what happens to me. It s fear and terrifying with current boyfriend. Told him i could no longer be with him. He made remark why would I want to be with someone who reminded me of my ex husband. Is there any way to help him understand what really occurred to me? He is 70yrs old and quite narrow minded. Should I let sleeping dogs lie? I d really like him to understand and not be flippant about something that doesn t deserve being taken seriously. I don t have a working email address, haven t been able to access for 5yrs. Have a phone number will that work?