Carolyn,. I know exactly how you feel. Well, not exactly. I can't even begin to imagine having to set up and break down nine tables!!! When you're exhausted it's easy to get discouraged, too. I think craft fair sales are off in general. The economy just isn't bouncing back the way we hoped it would. Since sales are down, would you consider bringing less product? Maybe at least your set up and breakdown wouldn't be so exhausting.
The two times that I almost quit were when I'd been burning the candle at both ends and really pushing myself. I work every other weekend on the evening shift, and there were craft fairs that I wanted to do, and they were on the weekends I worked, so I did craft fairs both weekend days and then went to work afterwards.....and I just wanted to crawl in a hole and die. It's easier to bounce back when sales are great, but when they're just so so, and you're exhausted on top of it, it can really make you want to throw in the towel.
Maybe if you can scale back a little until things pick up again......at least I keep hoping that they will. Know that you've got lots of us who are in the same situation, and sending you hugs in sympathy. If people only knew how tough this is, there wouldn't be so many people wanting to get into the business of selling soap!