PSTD is like you are describing. Repressed memories that come back to you. Just remember one thing. Your mind will protect you. The mind is powerful and will only reveal things to you as you are able to handle them. That is why it seems like when things are going good, the memories come back. It is because you are relaxed and getting stronger.
There is a book called repressed memories and one called the sexual healing journey. They are both good books to help you. Try to see a counselor. They will guide you through this. You need that right now. As everything seems to be flooding. But like I said... Your mind will protect you. It will never give you more than you can handle at the time.
I hope that this helps some.
Hugs, Karen