my thoughts ...how a person remembers things can be normal or any number of physical or mental problem...

what jumps out at me in your post...eating dirt and hair....here in my location this is not called dissociation. here in my location eating dirt and hair is a medical problem called Pica. its where if you dont eat right , get enough vitamins and minerals the body craves those vitamins and minerals from other sources than food, like eating dirt, hair, rust, paint and other high in iron and minerals sources.

here in my location dissociation is a reaction to a trigger....

example getting scared or nervous about something causes me to feel numb and spaced out, feeling numb and spaced out is a dissociative symptom.

there is memory problems with some dissociative disorders but other things can also cause memory problems to the extent you posted...stress, lack of sleep, lack of food, lack of fluids/dehydration, gosh here in america there are so many normal things that can cause a person not to remember huge chunks of their life, even genetics (in other words not having a good memory can just be what happens to run in some peoples families. ) Here in america we also have so many medical problems and mental problems that can cause a person to not remember much of their childhood.

the bottom line though is that we cant tell you what your problem is. only a treatment provider (doctor, therapist, psychiatrist...) can tell you that.

my suggestion is that if this continues ot bother you contact a treatment provider in your off the computer location. they can diagnose whether this is normal for you or if its a medical or mental health problem and how to best treat it.