I feel your pain. I suffer from severe nausea and vomiting on a daily basis. It's miserable. I am diagnosed with a disorder called gastroparesis. Maybe you should get checked for that? You could also have some type of bacterial infection. There's a variety of tests your doctor will need to set you up with to get to the bottom of this... good luck, I hope you start feeling better soon!
Try taking some Tums or some kind of antacid before you eat anything. Let's just say you're coating yourself internally before eating. If that doesn't work see a doctor cause it might be worse than you think