My 10 Year Old Daughter Gets Nauseous As If To

my 10 year old daughter gets nauseous as if to feel like throwing up, with a sensation in the front of her throat; sometimes also combined with headache sometimes immediately after wating sweets like chocolate. She also doesn't eat very large meals, often feeling full very early, or having to leave the table for the restroom before finishing her meal. She doesn't eat any meat, other than occasionally eating fish, and pretty much no dairy either other than minimal amounts of cheese or chocolate. She is by no means overweight. Should we be concerned about diabetes or hypoglycemia?