Stay at Home Mom , Confused about Going back to work

I am a 33 Year old Stay at Home Mom .......Well Kinda ! I watch 3 Little Ones during the week to have an Income . My Husband is a Long Haul Trucker. So before I had my son 2.5 Years ago , I worked in Car Sales during the recession and the Chrysler Bankruptcy. I decided that working on 100 % Commission and having 2 kids in daycare was too expensive , so I decided to stay home and watch a few kids to pull my weight and be home with the kids while they are little . I have been home for almost 3 years and I am going CRAZY ! I love my Kids but with my Husband gone all week I feel Stuck ! My Daughter is now in school Full Time and I would only have my son in Daycare . I really really enjoyed working in Car Sales and they have changed so much in 3 years a lot of Dealers are now Salary Plus Commission . The Thing is , whenever I try to talk to my husband about how I feel staying home all the time and wanting to work or take some courses , he tells me to stick it out until Ethan is in school in 2 years ! Some Days are better than others and Yes I like being Home , Yes I like Spending time with the kids , but There is no Me Time, I am never alone , I have kids come at 7 am and my kids go to bed at 930. I am not Unhappy but I am not Happy with myself I used to feel Great about getting dressed up , selling cars and spending quality time with my kids. Now I don't feel like they have the best of me , I loose my patience easy and that can't be good for any of us. I guess I am looking for some advice on work , how to approach my husband , to do car sales...............Help !!