I Left Work Yesterday Not Feeling Well To My Stomach!

I left work yesterday not feeling well to my stomach! Nauseous and saliva forming and thinking I had to vomit any time! I made it home , stayed home today and still have the same feeling. I had toast and banana for breakfast. Chicken noodle soup GF for lunch and something salty for a snack. I feel very weak. I work with kids in the class room and some had stomach pain the other days al