Yes I have woken up from bad nightmares, dry renching and vomiting on occassion and had to keep a bucket beside the bed for nearly a month, as well as several episodes in the shower when I started thinking about body memories. It does pass, but it certainly isn't pleasant.
I get all sort of weird reactions that relate to panic attacks, and have even had intrusions that are like a panic attacks that come on even though I am not thinking about anything, and I am resting and going to sleep. All of a sudden my heart is racing, my breathing is fast and the nausea flashes in, and I have no idea why or where it comes from, it's very crazy making. It feels like it's not me doing it, at times I feel like I am pocessed, because I am just sitting dosing off and then I am thinking what the hell, while something takes over my body.
Sorry you are going through that.:(