First of all: Worst advice I have EVER heard and that goes against everything you will hear from La Leche and Lactation Consultants is "If she gets hungry enough, she will take the bottle"... That usually ends up with an even more frantic baby who is so hysterical they can't latch. Most breastfed babies will not take a bottle from their mom. As for actual bottles, I carry mimijumi for pumping, working moms: http://www.mymammasmilk.com/Mimijumi.html - Best breast bottle I have ever seen in over 10 years.
Secondly: Ditch the job. Money will always be there to be made, but your child's babyhood is fleeting. I gave up my career as well and I am so glad I did. You can get by with less (we did). You can qualify for WIC (food assistance checks) Food Stamps, State run health care, etc. Whatever it takes is what my husband and I said and we stuck with it. My legacy is my children, not my bank account. And some things, like being there for my kids, cannot have a price tag.
We have a mom in our club (Cape Cod Breastfeeding Moms - we are on Facebook) and she was in the exact same situation. She had intended to return to a very good paying job which she actually liked, but once her son was born and they were nursing happily, she just couldn't go back (he is now 8 months old and still loves the tatas!). At first her husband was a bit nervous, but they have gotten by fine. You just cut back - you can live on less.
Cloth diapers alone can save you about $500 a year. And between the other things I mentioned, many people can make ends meet. You can also babysit for other people (I do 2 days a week and make $120 under the table) or, if you are crafty, sell handmade items on Etsy.com
Think of it this way: What would you have to pay for excellent daycare? Now subtract that from your income. Now ask yourself: Of what money is left, how much of that is critically necessary to keeping a roof over my head? Can I cut back in expenses to make up the difference? Can I qualify for state help?
You may even want to ask about telecommuting (I did it for almost a full year after my daughter was born and told them I would take a pay hit to do it that way - they loved that because I still did what they needed, but at half the cost).
And, by all means, join our club on facebook: Cape Cod Breastfeeding Moms.
Peace-Love-Boobies!