I'd say there is such a thing. It's probably completely different from sub space; which from what I've seen from Mine is that sub space is the total release of thoughts and surrender to sensation, whereas dom space for me is the complete focus of thought, into a sharp, single point which is the sensations I am causing in my sub. When I'm really, really into it, I tend to forget about myself completely, as I am solely focused on him; I have even cummed just from something I was doing to him, without being touched at all myself (but maybe that is only a female thing?) His body and mind become the point of everything I do, and I could care less about anything else, including myself, to the point where I won't hear the phone ring or a knock at the door or thunder outside or anything that isn't him.

How do I feel afterwards? Immensely, completely satisfied, to the point where I will actually not want to have sex (until the next day, of course).