I assume you live in the US... if not.. ignore this.
Breastfeeding is free food for your baby if that's the route you want to go. If not, apply for WIC. Apply for WIC either way though. Look into cloth diapering and other methods if you haven't already. It might be something you want to do. Have your husband apply for unemployment and continue looking for work. Apply for child care assistance to see if you would qualify. If so, you can also apply for unemployment and continue looking for work. If you're denied though, it's generally cheaper to be a stay at home mom. Child care can be expensive, unless you have family/friends who could do it regularly while you work.
It's natural to be scared in general though. You will be a great mom. Good luck!