What you have described as a panic attack by her collapsing, that sounds more like the startle response being extreme which is not unheard of and just about every one I know with PTSD has it. Just try to avoid loud noises!

But amnesia to the extent you describe and switching hands sounds more along the line of brain injury, not PTSD, though I am not an autroity on it, just have it. While it is normal to have no recall of the trauma and still have PTSD from it, the way you describe is she has lost about a years worth? Or am I reading that wrong? Personally it is not unheard of me to "lose" a week and not be able to tell you what I did or who I saw. A few other people here do that.

Good luck Steve and I hope you do not mind me moving your original post to Introductions. Welcome, and I hope collectively we can help you with all your questions, and do not forget we also have a welcoming spouse section too for your support in handling it being a care taker.