frustrating, isn't it? i used to miss a whole lot of days from school when i was younger because of migraines. (like a gazillion years ago) it's a wonder i even graduated. sounds like your parents just don't know what to do anymore either. the only thing i can offer is peppermints or potatoes to get your stomach back on track. for whatever reason they seem to settle and be easier to digest, lol not together though.
you might talk to your doctor about trying some of the Rx antinausea meds. phenergan is my friend. wouldn't it be nice if your school had cyber classes?

thinking of you and praying for a good outcome.

hugs and prayers