Well, what I know about memory is that it is *normal* to not remember chunks of childhood, particularly before the age of 10. So, your inability to recall stuff from that year does not necessarily mean that you were dissociated for the entire year... it may equally mean that there was nothing significant to recall, or you have no external triggers in your life now that remind you of things from that peiod of time.
If you ask others around you (workmates, family, friends) you may find that it is quite typical for people to not recall major chunks of childhood, especially up to the age of 9-10.