I know how you feel hun, I had a miscarriage last Saturday, although I wasn't as far along as you, it has still gutted me. Things will get better I promise you. I spent two days crying my heart out. But now, although I'm still very sad about it, I have managed to move forward a bit. I'm feeling more positive about things.
You need to give yourself some time hun. You will never forget your baby but you will eventually be able to deal with this. Stay strong xx