Hungry, but too nauseous to eat!

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I'm constantly nauseous, like everything I look at makes me want to puke. I don't know whats wrong, I get hungry and try to eat, but I get nauseous the second I see the food. Problem is, I'm starving, and often have to force down bagels (the only thing I can manage at this point, and that's no where near healthy for me) Whenever I eat the nausea gets worse. Any idea as to what might be going on (I'm not pregnant, I have an IUD in me so that's impossible) How can I get myself to eat.