I'm a 20 year old female who has the same horrible symptoms as you to the point where I have to carry an emergency cup in my purse just in case. It's very difficult for me to predict when the regurgitation will start or stop. I've tried regalin and it seemed to be working for a few days, but then I was back to vomiting after every meal. I also had no luck with nexium or other acid reflux medications, although I'm starting Protonix today. Marijuana also doesn't help for me because I don't seem to have nausea.
This has been going on for nine months, and I think I've tried every test: upper GI, ultrasounds, gastric emptying tests, and I even had my gallbladder out and no luck.
I'm a vegetarian with a fairly healthy diet, but not very much B12 so if we have the same etiology, I don't think that's your answer.
Please let me know if you have found anything that has helped you.