I don't know what to do!

I was a single mother for 15 years. then met a wonderful man got married and had a cute baby boy last year. it's great for most of the time. I just started my own business. I work 11 hours a day pluse I have my two kids after work, so I really don't get a break. I'm tired all the time, my husband gives me breaks on the weekends and trys to come home early sometimes on weekdays. but now we're trying for baby number 3 and I'm having nightmares almost every night. just random things. I don't know if I want a baby if I'm already tired, and work so much and take care of house. I could close my business for awhile or get help. but I still fill wired. I have friends that are stay at home moms and I wish I could be like them and just get money whenever. I do want a baby but just not work so much.