humans have this strange capability to retain memories in the mind,
you think u might not need these memories but then do u think that
by forgetting everything, problems is going to be resolved, by
choosing to lose all memoroes, nothing is going to be resolved.
instead will only hurt those who cares abt you though. i'm talking
the perspective of a guy who have lost all his memories and fail to
recognise even his family n frens.
there was one time i was staying in the hospital, these was this
guy who was hospitalised because he just lost his memory just like
that. he do not remember himself, he do not remember his family n
friends, he do not remember anything. his mum was very upset,
everyday bringing his favourite stuff for him so that he can
remember something.
my mum saw this and she told me that lucky me that i only cannot
move but i still remember her else she would be very upset
though.
on another note, if you are talking in the perspective of a
person who have gone through so many hurts and sufferings and want
to forget. i would say to the person, time will heal all wounds but
first the person have to make the decision of letting go though and
move on.
wow. u hospitalised so badly. my worst was fell down stairs and
skull crack. oni need a few stitches. lucky you ok now. 
