I've done both.... a full time working mom (100% out of financial need) and a stay at home mom. Both have their pros/cons. It's always a struggle finding the right balance no matter what. And you have to have a reliable, supportive husband no matter which path you choose.
Working kept my brain moving more and kept me busy, busy, busy! As soon as I'd get off work, I'd run over to day care, then run home, cook dinner, change diapers, do laundry, play with baby, etc. I'd never sit still from 5:30am until 9:00 pm (if I was lucky). It was contstant forward movement! But I think it really made me appreciate the time I had with my son and I always made the most of it....quality over quantity. The other problem with working is somedays are so long and it's so hard to be away from your child and reprimand them when they're acting up. You just want to relax and enjoy them...but you've got to still be a parent and enforce the rules too.
As a stay at home mom, I keep busy with MOMS Club and other groups where I meet up with moms almost every day for play dates, activities around Omaha, etc. There are message boards for moms (myomahamommies, metro omaha parents on MSN, and meetup.com). I think there's also multiples support groups which you may want to look into. Many of these groups actually have nights out just for moms w/o kids. I would absolutely go crazy without these types of groups. I love staying home, but man, there are some days when I wish I was somewhere else...it's hard to play candyland 8 times in 20 minutes. It's hard to deal with tantrums ALL DAY LONG. It's hard to have to repeat yourself 80x in one day...and start over the next day. If I had a colicky baby and had to stay home, I would probably lose it. You can't just walk away when you need to, like you can at work. There's no time off.
Choose what's best for you and your babies..don't worry about what anyone else thinks or says. It's ok to go back to work now, then change your mind too....