Sometimes when things would get really tight with money I would grab some books that have already been read, cds and videos that folks don't watch anymore, knick-knacks, clothes, toys, shoes, etc. and sell/consign/ or craigslist them.
Sometimes it would only be only a bit of money but I was often surprised by how much I got. I would then put most of the money toward food and house repair supplies. A bit left over I would get something for the family like a traded video or cd. Since this was stuff we weren't using anyway it would feel like a 'bonus' and the house would be less crowded.
FlyLady recomends just donating stuff but my budget was so tight that money from clutter was quite helpful. AND your house is cleaner.
Another thing that might help is doing errands with a friend and split gas. I had a friend without a car and they would use my car and put in extra gas. It worked out well.
Another bold move is to think of ANY skill you might have (baking, knitting, sewing, car repair, yo-yo tricks) and post on craigslist for private lessons. This worked for me and developed into a business later.
There are often emergency funds on the State, County, City, Church level that folks don't know about.
I want to emphasis that certain solutions work for different people. Also, when getting help don't let anyone make you feel badly. Everyone needs help throughout their lives. You are a great Mom because you are so pro-active about getting help.

Good luck and best wishes.