Yes, I have dealt with something like this as well. I know that some people take a break from sex while working on these issues and instead, focus only on what they can handle within the relationship(examples like hugging, holding, kissing only). They gradually get to a point where they can start to be sexual with their partner and even communicate when something feels overwhelming or they start having a flashback. It is very hard and can be a slow process, but I do think recovery is possible. Remember, it is your body and it is okay for you to take care of yourself, especially while working through trauma issues. Would your partner be willing to go to therapy with you?