Sadly as we get older we lose more and more. I am sorry to hear about your brother, thankfully I haven't lost anyone that close to me yet, I dread the day I lose my mom. I have lost my grand parents who I was very close with but they lived a long full life (it's never long enough), and several friends. It's hard to accept that you will never see that person again on this earth, I still feel the loss even after years. You just have to remember the good times and try and move on. I was just thinking yesterday of how the world has gone on and what has happened even after those I cared for have gone.
