Hi Maryann,
I know how you feel. I have two girls and worked from home while raising them with a husband who travelled throughout most their lives. It's so tough. I did want to mention that I used a site that I think you'll enjoy. It's free and it's at
http://www.learnthroughgames.com. They actually have free games that you just print out and play with your preschoolers. The games are actually made for kids that are 2 - 4 so you might want to check this out. It really helped me on those days that I felt like I was going to pull my hair out if I had to come up with one more fun thing to do with my kids. I hope this helps!