Alright, sorry for my first comment.
Right, I've never experience dead to my family members, only to my grandfather which sadly died when I was younger. However, even though my dad is not dead, he is dead for me. He abandoned me when younger, only having my dear mother's presence. In all seriousness, I can tell you it gets better. "Don't cry because its over, cry because it happened" —Dr.Seuss. Just get out and cry out loud. Express yourself, be yourself and remember what made your brother so special. Brighter days, they come, they go. Look for them.
Hope you're feeling better now, and remember you have your friends, family, even randoms on the internet to support you, help you, make you feel better.