Is drinking 2L of Diet Coke bad?

Ummm. I lost track of how much I was drinking today.

Since I had a 2L bottle of Diet Coke readily available (and chilled) in the fridge, I grabbed it and ran out the door w/ it this morning. It is now looking ominously drained. I am not. But I am feeling sloshy.

I wonder if I will get any sleep tonight?