Some corrections

I'm not feeling well.

 

What are your symptoms? -> X This sounds too serious. 

 

Instead, use there. :

Are you okay?

What's wrong?

 

What's wrong with you? -> X 니 빡대가리냐? 왜 이래? 

 

TGIF : Thank God it's Friday. -> Too old-fashioned

Good thing, it's Friday!

 

I take preventative action -> I'm trying to prevent it from hurting.

Okay? -> It sounds passive-aggressive.