Ping of my Best Friend?

My Best Friend just ped yesterday. I am having a hard time. She was so young (43) - I am 36 and finding it difficult no matter whom tries to lift my spirits, it is hard to accept. I have been a complete wreck. Knowing I will never see her, talk to her or hug her again. being young myself, I can't process the thought of never sharing her the rest of my lifes pains, happiness, struggles, faults and joys. I have friends, but nothing like the very deep friendship I had with my best friend. She is the one I told everything to, my most personal issues. The one that has supported me and vice versa. The friends I have are just ones that I go to lunch with or some outings with now and then. Nothing of a deep deep friendship. How do I function in my mind after losing such a person in my life? I feel like I have nobody. Yes, a husband a Son, family (supportive too) but not my best friend. If you have lost a best friend and understand this can you please give me some support in how you managed to move forward? Thank you.