I'm so sorry you are feeling this way. I have been lurking here for a while but have not posted anything yet. I just had to respond to your message though b/c I am in the same situation. My DD is 18 months old, and I had a D&C in October as well. My due date was May 27. Up until this month I was coping pretty well.
When I start feeling down, I just try to think of my DD and how happy she has made us. Sometimes it helps and sometimes it doesn't. It really is very difficult to separate the joy you have for your DC, and the sadness you have for a previous loss, or inability to give your DC a sibling.
What makes matter worse for me, is that my two SIL's found out they were pg within 2 weeks of when I found out. They are both going to be having their babies in a few weeks, and we are going to go visit (they are in another State) shortly after they are born. I honestly don't know how I'm going to make it through that trip.
You are not alone in how you feel, and I wish there was something we could all do to make it better. It is a comfort to know that I am not alone in how I feel and have a great source of support in the women on this board. I hope you all have a wonderful time at the party!!
DD (18 months)- Conceived on 3rd IVF attempt
Highest FSH (15)