Do it, just do it! You have all the reason in the world to go through with it. Nothing that we want in life comes easy. Its going to be hard with two babies, but it is doable. There are alot of mommies on this forum that can be a shoulder to cry on when you need it. There are a lot of people in this forum that understand where you are coming from.
The fact that you recognize the position you are in and want to get out of it, says alot. You have the determination. Yes its going to be debt, but nursing school is an investment. Keep the future you want in your mind's eye at all times, don't hold yourself back, and go for it. Once it is all over and you pass that NCLEX, you will be making enough to pay those loans back, take care of yourself and your family the way you want too.
I know everything we say is easier said than done, but I agree with Kymmi, go to the financial aid counselor ASAP, tomorrow if possible; speak to them, do this immediately, the faster you get your questions answered the easier it will be to make this a reality. There are several private loans availble, such as Sallie Mae, check out http://www.salliemae.com/
they have several different loan options.
You should also look into Judy Lawrence The Budget Kit to help with budgeting while you are in school and after school.
GOOD LUCK, you can do it!!!