thanks misseskimo. no, there's not really much in the way of support for anything here, and even getting normal antenatel appointments has been difficult. But that's par for the course with the US health care system... We are in the process of transferring to a midwife-led childbirth center, rather than the ob/gyn unit we were with previously, so when we meet a midwife for the first time next week I'm going to ask her advice.
But for me at least, just acknowledging to myself that what I was feeling was not normal made an enormous difference, and helped me start to help myself. Also it made a big difference when I finally asked my partner about it directly, and he agreed that he thought I was having difficulty. (In the sense of, it was important to get someone else's perspective because up till then I thought maybe I was just over-reacting, iyswim.) I've had depression in the past and have always found being very open about it helps me a lot. It's more of a problem when I try to keep it secret and bottle it up.