I had vomiting for the first 7 weeks after surgery, almost every single day--why? Because I was not on a PPI!!! My surgeon does not routinely prescribe it post surgery. Once I started taking Prilosec, it was like a miracle--suddenly, food stayed down! Now, I still can't eat much at one time, only a couple of tablespoons per "meal," but it stays down and I'm feeling so much better.
If you're not already on a PPI, get some generic omeprazole and try it out. Can't hurt and might help. Use it for a couple of days and then try something really bland and really soft, like mashed potatoes, and only eat a tablespoon... see if that stays down. At this point, don't worry about carbs or whatever, just see if you can get something gentle to stay down. Tiny bites, please, and wait a few minutes between bites.
I really hope you find some answers--NOBODY should have to go through vomiting every day, and I should know!!