I get the same way. But I am pretty sure I know where mine comes from.
I have generalized anxiety disorder, but it goes hand in hand with my ptsd.

I have spent the last 2 weeks right where you are. I am almost 99% focused on the situation triggering this. I still go to work and I come home, but other than that I am mostly frozen and I will stay that way until I get beyond what has triggered it. I can also be cranky and snippy.
I have to drag myself to accomplish other tasks and the more I tell myself to stop, the worse it gets.

Depending on what is triggering this, I too can feel like the helpless little girl, but that is the ptsd. Emotional memories do not go away and I know that is why I have that reaction.

As soon as I get beyond the event triggering this, and the outcome isn't the same as the original trauma, I will be fine. I do not let myself avoid these things. It is only from getting through them that I will be able to make it go away. Easier said than done.

I hope some day I won't have to experience this as often. If I search my memories hard enough, I can always find the experience that triggers it.