I am so sorry to hear about what you are going through. I miscarried years ago and remember the grief I felt. It is different for every person who goes through it, so i'm not comparing my pain to yours.
I found that the questions from people that didn't have a clue were the worst. They ask in good faith, but then feel like heels when they hear about the loss.
With women who deliver they too go through a time of mourning. When the hormone levels decrease.
I know it is hard to believe, but it will get easier. I'm sure you will have days that you will think about the loss and you will be sad, but one day you will have a beautiful baby to love and nurture and though the one lost won't be forgotton or replaced the one with you will be loved beyond belief.
As for trying again, your ob should be able to tell you when it is safe, but you will probably need to wait until your body heals a bit.
Good luck!!!