Hang in there Brooklyn! I don't remember if I've told you over on the MFI board, but you should see huge improvement in DH's counts very soon! My DH was on Clomid before he had his varicocele repaired and it brought his counts from 5 million to 22 million in approximately 2 mths!!! Your BFP is right around the corner...I know the wait is a b****, but we have to be strong and pull through for ourselves and our future family.
I don't blame you a bit for your reaction to your sister....she would have gotten more than a piece of my mind. It shows just how immature she really is that she can accept the fact that she had gotten herself in a bad situation, but instead took her own frustrations out on you! I probably would have slugged my sister had she said anything like that to me.
Try to enjoy your anniversary weekend and remember all of the good memories you and DH have had that wouldn't be possible if you had been irresponsible like so many other people.
Infertility has caused very deep wounds that are going to take a while to heal and feel normal again... we need to take care of ourselves right now and "give the boot" to those who are too selfish to try to help us. If you ever need someone to talk to, PM me... I think our situations are very similiar.

You're in my thoughts and prayers!