I'm very sorry for your loss. I'm not an expert, but I lost my mom in a quick non-natural way that disallowed me closure. She was a dear friend to me, too - so I completely understand how you feel. Sometimes I just want to call mom and tell her something, just to realize that I can't. So sometimes I just write a letter to her, or talk as if she's there. I'm fully aware that she will never get the letter, and that I'm talking to the air - but somehow it helps me. My own mom told me that there is no loss like that of losing your own mom, from whom you actually, literally came. She said it to me when she lost her mom, and she was right as I learned when I lost her. I hope that soon you get the feeling that she is right there with you, in your heart. Remember, her very blood runs through you as you carry her physically through you in the form of your genetic inheritance. You honor her through your deep love of her, and while I can't offer a lot of advice, I do understand and hear you.