Left work early, pissed off and upset.?

If you plan on going back, you're going to have to smooth things out with Wendy. There's no way for you to know yet whether she is an underhanded sneak who is going to keep pulling crap like this or whether she's just an airhead. Ifyou want to keep the job, you need to go in and sit down with her and say "Look, I wasn't feeling well yesterday and I think we had a misunderstanding. For some reason I have nothing in my notes about NDAs, so can we start over on that?" See how she reacts to that. It might be that you decide that you have to quit the job, and if she turns out to be a nastypants then it would be better if you didn't work there. But give it at least one more chance before you throw in the towel.