I cried at work and unloaded on my boss. What should I do now?

Sounds like you just need to relax. Take a step back and breathe and figure out where to go from here. It's a good thing you were responsible enough to talk to her about issues you were having. YOu were just feeling overwhelmed I'm sure and it all just spilled out, everyone has bad times like this and I'm sure she understood. Just wait and see what happens, it the mean time, relax.