I can definately relate.
I've often felt "empty" but theres a certain type of empty that comes along at times..
it's like.. you're numb, your eyes glaze over, you feel nothing, hear nothing.. you couldn't care less about whats going on around you, you're not even really aware of what's going on around you. you could be hit and you wouldn't notice..
I don't know if that's what you're referring to, but if it is.. i'm right there with you.

take care.
kelly. x