Yeah, I definitely feel overwhelmed by the idea of not enough money and too much work, or sometimes not enough work. I usually don't let it bother me but this week I got a little teary at one point. I usually choose to make a conscious decision to ignore the thoughts because I know we will be ok, but I also often think that I should be doing more to provide for us. I used to have four jobs and I've been slowly cutting back to one this summer but now I think I will have to pick up another again after the baby comes. I will get maternity leave but I can't afford not to work during that time.
Though I've never utilized the services, my friend is really good at finding support in the community...free food, baby supplies and classes, and anything else they seem to need. She sort of made it her job at one point to find this stuff.
The only suggestions I can make are to get another job (try care.com and craigslist), try to get things free (try Front Porch Forum and Freecycle), or downsize your life (cable, movie rentals, car use). I resorted to taking the bus this summer...not that pleasant, but much cheaper. You could also take advantage of some of the free meals in your community, usually at local churches.
Ugh! And there's family sometimes who can help. Good Luck. I think it will only get harder from here with children.