I've already explained the whole thirst/drink/urinate cycle back on CT. Wow. Thanks for listening.
And you've already asked this question tons of other places and nobody thinks it's anything serious. Not one. Not one person thinks it's serious, so stop worrying/yammering about it.

However, I've decided that the lack of appetite could be self-consciousness. You'd never admit to that immediately, but why don't you think about it.
Lots of people beat you up online and call you fat and whatnot, so now you don't want to eat.
People get eating disorders for a reason.