Identifying Emotions

Identifying Emotions - 

I feel sick,
but my expression doesn't show it.
Instead I remain blank,
like my art book.

I haven't opened it in a while,
the memory of the drawings that I did make me feel,
but I cannot identify what it is that I am feeling-
happiness?
regret?
nostalgia? 

I feel sick,
I think,
it's hard to tell.
And still,
my expression remains blank,
as does my art book.

[This is based off of the past; I'm fine now dw lol]