When is it ok to eat normal stuff after being sick?

I've been sick with a a virus for the past few days. The last time I threw up was Sunday at 1 am. I felt nauseas all day and night yesterday, and have had nausea off and on all day today. The only thing I've eaten is half a banana and a small cup of applesauce. I don't really have an appetite. I haven't been hungry since Saturday night. I NEED to eat a REAL meal but I'm scared I'll throw it up.