I would think it was some sort of dissacosation, if you can't control it and I've never heard of someone having an issue like this with anxiety.
I myself have issues with dissacosating, or removing myself from a triggering or nervous situaion, but not like this, I just go outside myself and remove myself from my emotions like I'm floating.

Do you see a T? It sounds like you may want to talk to your T about this if your seeing one. Is there something that triggers this, like a certain situation or place?

Feel free to pm me any time you want, I'm always here to listen to others and give support.