Hi.. Welcome to HEALTHCARE MAGIC.. I have gone through your query and can understand your concerns.. As per your complain vomiting immediately after eating can be due stomach infection/stomach flu, food intolerance or allergies, blockage in the intestines,indigestion,stress, side effects of medications, chemical toxins etc.. I would suggest you to consult a Gastroenterologist and get evaluated and a thorough clinical evaluation and investigations like stool test, blood test, Colonoscopy etc can help in diagnosis and treatment can be done accordingly.. As of now you can take Ondensarton for preventing nausea and vomiting.. You can also take proton pump inhibitors like Omeprazole.. If it occurs more after taking any specific foods eliminating it from your diet can be relieving.. Take small frequent meals and avoid eating in bulk.. You should also do regular exercise to keep your metabolism at a kick.. Hope this information helps.. Thanks and regards. Dr.Honey Nandwani Arora.