I have no idea what's wrong with me? Help?

Maybe G@G isn't the best place for health related questions but oh well.

for some reason I have little to no appetite, and when I do, I'm only physically able to eat rice, veggies, and maybe a piece of bread. If someone offers me anything other than that I feel like puking, and like it's too much for me to eat, or something like that. It never happened before.

for example my mom brought me pizza and I tried to eat it but I just couldn't, it felt like too much. I've drastically lost weight, and I don't know what to do. I don't have a history of eating disorders so I'm kind of worried.
I have no idea what's wrong with me? Help?
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