I am so very sorry for the great loss you are suffering. When my mom died, I read every book on death and heaven I could find. Then a friend said, 'what does the Bible say about death and heaven? That is where you need to be reading." And she was right. There I found true knowledge and peace. Look to the Lord for strength and peace, for that is the only place you will find it. Talk to anyone who will listen, because that helps so much.
God bless you.