As it was explained to me, DA is the loss of the memories, blank pages in your time (which I have a lot of), especially around traumatic events. DD is the feeling that you're out of body/watching yourself from a distance, can't really tell if it's a dream or reality, if something just happened or you imagined it. I found some good info on the Mayo Clinic website, that probably explains it as well as my medical professionals explained it to me.