I've been doing so good for such a good while. Why does this have to start now?

I've been up since 5:30 yesterday morning. No sleep AT ALL last night. I tried.. sleep was just nowhere to be found for me. Thoughts racing through my head faster than lightening... I can't sit still. And even if I sit down and try to be still.. my foot or my leg ends up shaking like crazy. I was feeling odd yesterday.. I should have known this was coming. I guess I'm just discouraged because I was doing so well. I just feel like I've totally crashed. But in the back of my mind I know this can be fixed... I can get through it, and get stable once again. It's just so hard sometimes... and I need to vent. Right now I feel like I could claw my way through a wall. I'm so tense and just wired... I guess that's a good word for it. Okay, vent over... for now, at least.