These things helped me - vegemite, soda water, not allowing myself to get hungry, carbs.

I couldn't handle water at all - only soda water, mizone or really weak cordial. The last two are easiest to throw up I was vomiting up to eight times a day but thankfully that's all passed and now I can drink water again - hooray!

I sympathize with you and hope you find something that works for you.