It doesn't sound like DID to me, however, I am no expert, not even close. It does sound like Psychogenic (Dissociative) Amnesia, though.
Situation-specific amnesia is a type of dissociative amnesia occurs as a result of a severely stressful event, as in post-traumatic stress disorder.
Psychogenic amnesia is a psychiatric disorder characterized by a sudden loss of memory covering a variable period of time, an absence of underlying brain disease and an awareness by the patient that a memory disturbance is present. LINK to more info
Also, have you done any reading on fragmented ego states?
LINK to info from another thread
There's also DDNOS.
LINK to more info
Hope you can find some info that helps! It can be scary.