I have been to see a consulatant recently to discuss dd's birth 3 years ago (6hrs of pushing, episiotomy, failed manual rotation, failed ventouse x3, dd in distress, emergency cs). It was so very, very helpful. I have had ptsd, flashbacks, panic attacks etc since then and I thought it would never stop. I haven't had a panic attack since. I had been through my notes time and time again and there were things I had missed that helped clear my head enormously.
My main tips:
Take a list of your main questions.
Don't hold back. If you need to cry, cry.
There is no such thing as a stupid question.
If you don't understand ask them to repeat.
Be prepared for the fact that for some things there are no answers.
Don't feel you have to rush, you can go back again if you need to.
Good luck. I hope it helps you.