You're the first person I've ever "met" who experiences the same thing. I feel so crazy sometimes because no one can see what my brain is creating. It's like a full blown movie in my head. I see every gory detail. It's not even that I really believe it's going to happen, it just sometimes feels so real that I have to remind myself that it didn't happen. The emotions get so strong sometimes that I forget it's not reality.
I also have occasional hypochondriac tendencies. Again, not that I really believe it's true, but my brain starts imagining the whole scenario playing out (hospital, dying, how my husband/daughter would react), and I immediately get that amped up, panicky feeling inside. Are you a total control freak too? It took a long time for me to make the connection; that I'm a control freak as a result of my anxiety. The more I can feel in control of things, the better I'm able to cope.