D.C.
I gave up my career 45+ hrs wk to stay at home 12 yrs ago. I don't regret it at all. The last fours years I've returned to work part-time at my daughters school which is ideal because I only work when school is open...nights/wkends/summers off. How lucky was that BUT it's not related to my career and the money is nothing. Our savings got put on hold, no vacations, no big purchases, but I got to raise my two daughters not daycare! Budget: I spend a lot on nice suits/dresses, shoes, dry cleaning, gas driving to work and fast food for dinners. By staying home I wear jeans/tees, changed my car ins to reflect less mileage,, used less gas and had time to look at coupons and best buys, and prepare most or all our meals at home (if you count McD's every once in a while or take out pizza).
When my girls were young, the costs were little to care for them. Now that their 9 & 11, their clothes are more expensive, we have sports costs, saving for college and house repairs to consider. With less than 15 years left till my husband retires, now is when I need to work again.
I think you need to talk to your husband about how secure his job is and if he will support your decision to do this. Good luck.