This may sound like I'm not being serious with the suggestion, but I am.
Sometimes I find it helps to just give in to the pain and grieve. By that I mean, find time by yourself and just let it wash over you. Focus on it. I have set time limits on this before (say, 30 minutes), and find that I get tired of it before then. I will just wail, if that's what I feel like doing. I will feel sorry for myself. I will be angry, if that's the feeling I'm fighting.
I have found that fighting the pain, trying to be strong, etc, is just exhausting. Fifteen minutes of surrender makes me feel better. It lightens my load.
I've done this with a time limit, and I've done this and prayed for the pain to be taken away. Either way, I feel better, and get moving again.
Good luck. Better days are ahead.