Keep drinking water as it will flush out whatever it in your system. Water is good for you. Peppermint Tea is good for poorly stomachs as well. It sounds like anxiety because you had a dream you were going to get a bug and your subconscious believe you may be ill. Take some pain killers for the cramping and don't eat. If you feel a bit better in an hour, eat something small and bland as it also may be hunger.