I know you've said you've tried everything, but have you tried some Saladas? I found that room-temp ginger ale was awesome... apart from the reflux because of it. But reflux is better tham m/s.
Talk to your OB. He should be able to help you out. I was sick with DD, but didn't take any drugs as I had concerns about them affecting her.
Ginger nut biscuits are also good. Just snack on them.

Hopefully things calm down fast.