HELP! I CANT SEEM TO GET BETTER.?!

This past Thursday night, I was light headed and felt sick and had diarrhea. Friday morning I was feeling kind of better but still had diarrhea. I ate 3 pieces of toast around 6 at night, sipping on 7up and then went to bed. I woke today feeling better, no diarrhea. I've eaten toast, some crackers and just now I tried eating chicken noodle soup but it made me feel sick. Yet, I still feel hungry! What should I do?

I keep burping and my mouth is watering a lot, too. Any answers to anything would be helpful.