I am so sorry that you are going through this loss. I'll keep you and your brother in my prayers now and in the days ahead.
Although you may feel alone right now, I believe the spirit of our loved ones stay with us. I remember feeling my husband strongly after he passed away for some time and still know sometimes when he's around. It's very comforting to listen to an inner voice that's saying, "It's gonna be alright. I'm very near so just talk to me when you need someone." I still find myself talking to him and I know he hears me.