I hate feeling that way too. It happens to me occasionally when I am in T. Something that comes up in discussion, and it feels like I am being dragged outta my body, or my body just shuts down and I feel way out in the distance. I get stuck there. I feel mortified when I come back.
Now that I am beginning to recognise when it happening, I fight it to stay in the moment, like I'm talking to myself as you described, telling myself to stay here. It is exhausting for sure! I'll be glad when that stops happening so often.
Take care of yourself Hellion