Good for you.
Regarding the finances: my food bills have gone down since I stopped buying cheese and milk. I'm not 100% vegan, but I eat that way most of the time. Even with substitutes like soy milk and tofu sour cream, getting protein in the form of canned and dry beans and tofu is so incredibly affordable, it's definitely represented a net savings. Sometimes I look at how full my cart is and how low my final bill is after a grocery shop and I shake my head in disbelief.
Money has been tight for me recently too, so I sympathize with your situation. Good luck to you!