West Side Story?

I feel shitty
Oh so shitty
I feel shitty, and spitty, and light
And I pity
Any girl who feels like me tonight

La la la la la la la
La la la

I feel warming,
and I'm cramping
Feel like running and prancing to bed
I'll be stuck here
On this toilet until I'm dead

La la la la la la la
La la
La la

See that shitty smile in that mirror there
(What mirror where)
Who can that disgusting girl be?
(Which what where who)
Such a shitty smile, such a shitty cramp, such a shitty day, such a shitty meeeeeeee

I feel awful
I might topple
It's unlawful how awful I feel
And so shitty
That I hardly can believe it's real

For anyone who loves musicals, wakes up feeling shitty, and randomly starts singing West Side Story's "I Feel Pretty" with the word "shitty" instead, like I do....