Just a brainstorm: does the timing of your eating matter at all? I know with pregnancy morning sickness they call it morning sickness because it frequently happens in the morning (duh) but that's because your stomach has had a chance to completely empty in the night. Every time the stomach completely empties (>1hr without any food or drink) nausea occurs.

For women who get it, eating crackers just before bed and each time they wake up in the middle of the night eating a few more, helps reduce symptoms quite a bit. I don't know if that has any bearing on your condition at all, but it's just a brainstorm because it's hard to watch friends suffer and not be able to do anything.

--Beth