Yeah, I know where you are coming from. I just had the third, and the (apparently) last big talk with DH yesterday afternoon. I had told him I wanted just one more child a couple of times, and he said no, but I thought if I could just have a conversation with him just the two of us, that I could give my supporting arguments and somehow we could work this out. But no. No more kids for me. And I'm devastated. I don't know how to really deal with this. The only thing I have come to plan out is to just completely devote myself (as if I haven't been already) to my only DS. Also, I have a couple of friends that have little babes, and I guess I can live vicariously through them. But there were many things that I couldn't do with DS that I wanted to do...and now I will never get the chance. So, I have no real advice, other than keep yourself busy..that's what I am going to have to do. It super sucks, but I can't justify doing what my mom did (and she actually told me this!) by "accidentally" missing her pills (which i'd have to get my IUD taken out) and whoops, she's pregnant. Even after my father told her no. I respect my husband too much to do that. After all, it's not about me.
It's almost like you're grieving a loss of a baby that you never had...I'm sorry that you're going through this. Because I know first hand just how crappy it is.