I'm glad you've already contacted a professional; that was going to be my first suggestion.
My own experience with PTSD is that meds helped very little (actually, not at all), psychotherapy helped a lot, and talking with people who'd had similar experiences was a mixed bag. YMMV, of course.
One thing that got me through episodes of anxiety/panic/fear was grounding myself -- telling myself where I was, what was happening, and that I was safe -- over and over and over until I calmed down or the triggering event ended.
Feel free to private message me if you want to talk. Gentle hugs.