Well, I was a SAHM for about that time, and I went back to work.
I was BORED.. I know that sounds horrible, I am with my kids, doing something that MANY can't do...
But it was with sacrifice. We sold our home, and scrimped and saved, and every year I would look into daycare/salaries, and realize how little would be left, and not do it.
Last year, though, I found a part time job, which was for me.. Yes, I got paid, but it was more of a break from the kids thing, than the money..(although the money has been the vacation fund)
This year, my baby is in kindergarten. I work about 25 hours a week now, and full time (30 hours at my employer), is right around the corner.
I am a better mom, when I go to work. I remember the feeling of what did I accomplish today? or Boy, I got two loads of laundry done, etc... I needed deadlines, and a place to be, to make me more productive.
Maybe it is time. Don't feel guilty about it. Its nice to feel needed in a different way at work, than it does at home. Yes, I am not doing rocket science, but it does feel great to be known for something besides changing diapers, and knowing the entire PBS Kids lineup.
Good luck deciding.