multiple episodes of vomiting

I was wondering if anyone that has been having multiple vomiting episodes in one day found a solution. I finally started to feel better until yesterday. Suddenly I was in the bathroom all day and couldn't keep anything down. I managed to keep down my prenatal by laying completely still and refusing to throw up. This morning I have already been to the bathroom twice and it's only 6:30 am. I'm a teacher, so I'm worried about how I'll get through the day. Crackers, sprite, and pregnancy pops don't seem to work anymore. 
I'm so hungry. Any advice will help.