I'm a SAHM too and have been in your shoes many times. The key is to find a hobby. I did a cake decorating class, have done photography workshops, and go to coffee with my friends. I joined a mommy group in my state and that helped a ton. I also decided to go back to school. My youngest will start kindergarten in two years and we're not having more...I felt I needed a career when that time comes. Good luck to you!
B-That's me! About to turn 30, mom to 3 brats, married to P for 11 years and dating S.