Yes, I do. When I'm walking outside and I think someone is behind me I feel the adrenalin pumping through me, my heart starts racing, I start shaking and I feel sick to my stomach. It happens all the time-even when I try to anticipate it. It's something that I've experienced throughout my life but I didn't understand it until the last few years when I realized that I had PTSD from past abuse and from being raped. It never fails to amaze me how many things that were "just" a part of my life that turned out to be symptoms of PTSD. At least I now know what is going on with me and why. Still trying to get to that next phase where I can actually reduce some of these debilitating experiences.