I think all the posts about sleep training, feeling overwhelmed, frustrations with DH... All stem from 5 plus months of dealing with the exhaustion of having a baby to care for. It manifests itself differently depending on what our priorities and parenting styles are, but in the end having a small baby is exhausting and trying.
I know with DD1 it all started getting better around the 6 month mark. By 1 year it was immensely better.
So hang in there February 2013 mamas. Months of caring for our tiny people who need us so much has really taken it's toll at this point. There is a light at the end of the tunnel though and it will start getting easier!