What do you guys think I have?

Everyday I'm tired and have a hard time focusing on anything without being tired. Even mental work is draining. Thinking is tiring. I am a very gassy person and I always need to have a bowel movement. Needing to poop, farting, digesting food, eating food, and even drinking makes me so tired and weak to the point I can barely move and right now I'm starving but I can't eat anything because I throw it up. Sometimes when I burp it feels like some of the food I ate is coming back up. So, as of today I decided not to eat anything.

What possibly could be wrong with me? ;/

Has anyone ever experienced this?

The only time when I'm not like this is when I'm hungry and I know that eventually I'm gonna get sick from not eating so...
What do you guys think I have?
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