Your post moved me to respond just so you know that you already found one coping mechanism.  Reaching out on this website.  

None of us really have any wisdom about how to cope with loss when someone dies but we can empathize on how hard it is.  We all feel just like you.  The emptiness of losing a soul to the unknown is a very rough road to walk alone.  So try to find someone who you can talk to about it.  A good friend maybe?  Do you have any other family that might be near?  

Talking about how much it hurts has helped me.  And lots of crying.  Endless amounts of tears.  I think tears are a relief mechanism and they should be shed in order to release the emotion we are feeling.  I do a lot of crying when I feel alone.  And when no one is around I cry it all out.  I talk out loud while I cry expressing my frustrations with the loss.  

I wish there was anything I could do to lift the burden of all of us who are suffering from the loss of our loved one but I cant.  Just know we understand.