oh my god... that is a horrible and very intense sounding dream.

I have had nightmares like that and you will probably always remember it, but it won't bother you so much and the actual ability to remember what you heard and saw will just fade even if you try to remember it, but you'll remember it happened and shutter. *hugs* :(

But the good thing is it was only a dream, and everyone who was hurt in it is alive and well and only you have those memories, and you can remind yourself it's only a dream.

Watching something funny and happy helps a lot :)