What is making me sick?

Alright so this has been going on for almost 5 days now so I'm going to seek help from fellow CC-ers to see if this has happened to anyone else.

I have no appetite. Every time I put something in my stomach I get nauseous and feel like I'm going to throw up. The thing is I WANT TO EAT. I don't know if I can count this as a flu because I'm not throwing up I can function properly it just hurts to eat.

It is literally a struggle to get to my 1400 calories MINIMUM that I need to be eating right now to be healthy. I have had to force down food and that is no way to live.

Any clue what this could be?

When should I get worried and go see a doctor?

Thank you so much for your help.

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