Good heavens mona, I'm awfully sorry about what happened with ex T.
For what it's worth, I had a mini-"going into shock" moment once in session. I had been seeing T for about a year, and I hadn't told her (or anyone else, for that matter) about my SH. One day I finally told her, and we spent the rest of the session processing it. At the end of the session when it was time to go, I tried to get up but then felt dizzy and I couldn't see because there were too many flashy dots.
T was really good about it. She got me a glass of water and helped me do a grounding exercise. And she sat with me and talked to me gently until I was okay again, and then watched to make sure I was okay going down the stairs. I felt really embarrassed because it was obvious that my stupid unconscious was like, "NOPE, NOT TIME TO LEAVE T YET." And I kept apologizing because I felt like an idiot and I felt terrible for wasting T's time. But she was very kind about the whole thing.