I am about 6 months ahead of you on this roller coaster. I went to visit my mother last may for Mother's day and I took my son. It was my wife's idea. While I was there, my wife told me that she wanted me to stay there and she needed space...
I have four children and three of them were at home. My take on this was, if my wife wants to leave "the family" that was fine but it was her leaving us, not me leaving them. I flew home immediately just to find a male family friend living at my house. I reasserted my love for my wife and even though she was P***d that I came home things were okay for a time, a month later I came home one day and she had left, but she left the children.
I thought that I was going to die at first, I would have panic attacks and times when I would forget that she left me only to remember or wake up in the morning and feel horrible.
I realized eventually that I did not want to have my wife back, early in our marriage she committed adultery and I forgave her, however this time when she did the same thing, I couldn't do it. I still miss her, but I think that I miss "someone" in my life.
I know it is a cliche but "you will feel better in time". As others have said, use this time to develop your personal relationship with Heavenly Father. Pay attention to little details, set up a scripture reading schedule, fast weekly, force yourself to serve others somehow.
Acknowledge to yourself that you are somewhat the "walking wounded" and give yourself permission to feel hurt and sad and mad and any other feelings. Take it easy on your self.
Realize that the end of a marriage takes two. If your wife really does not want to continue the marriage there is not much you can or should do. You can not convince her nor should you try. IMHO
Talk to other male friends who are sympathetic to you and try some guys nights out.
God bless you.