thirst vs. pain

Thirst torments me 
even in small amounts. 

I cannot get water. 
My tolerance is abysmal 
for wants I need, 
and I grow one goal. 

But pain is interesting. 
It fills me in one moment 
whole, and I have no need 
or want but to make it go. 

While it stays though, I find 
it compelling to know.