I dont think we ever lose something, because if you lose someone you actually gained something else, and call it whatever you want, because if you keep your brain on it you will find its like a big crash to yourself, then its like falling, then its like standing up again, so it means it made us stronger, to walk through life, and what if that person that you lost, is just waiting for you at the end of the path of human being, and he hopes and cheers for you to have the best life possible, and that when you complete whatever you have to do here, you will see him again, in heaven.
To overcome your grief here is something that may help
Life is to live and enjoy and give thanks. Together we can bring hope and a new generation, a much better one.
http://www.psychforums.com/viewtopic.php?t=23958