Nervous Breakdown

How do you tell if you're having a nervous breakdown.
It would be obvious, right?
There would be symptoms,
you would act,
and not just think, dark thoughts.

I catch myself in lies, like
I have to get the last train, and,
I have stuff to do tomorrow,
then scribble down my confession
while some girl reads over my shoulder
and moves to another seat,
as soon as she is able.

In the morning,
I was fine.