Need Advice on a Few things.......

I am the mother of two beautiful kids, 5 months and 6 years old. I never lost the weight from the first baby (actually put on 50 lbs) and am not losing wieght after the second baby. Any advice on how to fit in healthy meals (on an EXTREMELY tight budget) and exercise. I work full time and take care of the kids, home, homework, supper (typical mom duties) when I get home (hubby works at night a lot). What is the best day of the week to weigh on? How do I stay motivated to get up early to workout (which has been my plan but being a 'newish' mom with middle of the night feedings takes it toll on energy and sleep)? I could really use some practical advice. We do not have a gym where I live nor do we have relatives nearby. I feel terrible and am not happy with my size or health and I am tired all of the time. I want to be better for myself, my family, and God. I look forward to your suggestions. Thanks in advance :).