I have never gone into a state of shock in the way that you have described no. Although being sick (without much coming out) yeah i have had that kind of physical thing, although not so much a flashback but more like a dissociative flashback state resulting in that. Make sure the doctor checks you properly, it could be caused by something else, maybe something induced by the stress of the experience, good to get your blood levels (pressure, sugar) checked and also things like stomach ulcers which can come about due to stress. Many things can cause this state of exhaustion or confusion.
"...until lambs become lions"
I love you, little lewis, and i will never leave you. We are the same. You brighten my day, and i will make sure that i brighten yours. Hugs and kisses.