I had about the same thing, only I'd also pass out, be standing, sitting or laying down, be alert and talking to you and I'd go out like flipping a switch, they never did find out what's wrong, I got fed up and quit all the meds and treatment and I'm doing a whole lot better, but I think a lot of mine has to do with my nerve deafness, as I still stager when I walk and my balance sucks.
