T.,
I am so sorry for your loss. Like many women posting, I too have suffered a few miscarriages, and while I can't understand every circumstance in your life, I do know your pain. I've been there and yes, it's horrible. The pain of the physical loss is compounded by the emotional pain of this death, and death can be a very difficult event for couples to navigate, through no fault of either partner.
You asked how to deal with this. What helped me was to let each day be it's own, to do it one day at a time, and not to expect myself to feel anything other than what I was authentically feeling. I found, for myself, that it was a while before being out in public didn't feel otherworldly, like there was some weird disconnect between the daily life of the world and those around me (at the grocery store, or restaurant, friends who talk about other things...), and my own private world inside myself where I grieved fiercely.
Like many have said, men and women have very different ways of coping with miscarriage. There's a good book called "Unspeakable Losses" that deals with pregnancy loss and which I found very, very consoling and helpful. Pregnancy is never an isolated event, emotionally. We have a lot wrapped up in our hopes for our new baby, and when we lose a pregnancy, we grieve so much more than the child we had loved; we also grieve the loss of those future moments, the loss of repairing our lives through our new families---this shouldn't be diminished or ignored.
I hope that you will have friends and loved ones to support you during this time. People will say all sorts of wrong things: know that they come from a place of concern and a desire to make you feel better. This was one time in my life that I had to do a lot of forgiving because people still aren't comfortable with saying "I'm sorry" and leaving it at that, because there's really nothing more that anyone can say.
Like another poster suggested, if you find this grief is overwhelming, get some support. A therapist specializing in pregnancy loss can really help for us, and they give us a chance to speak openly and find clarity in what we want from here forward. I also suggest this because sometimes, this sort of loss is too much for some of our friends to absorb/support, and therapists are okay with listening to us grieve openly for an hour. So please, find a safe person to talk with about this when you are ready.
I'll be thinking of you. Please take good care of yourself.