Can you try eating something else? I am sure you can eat a garden salad, or a soup without getting sick. Maybe it is the foods that you are eating. If it continues you should see a doctor about it.

you have to go to the doctor's and find out why your doing that. if you dont have any health insurance you have to go to the emergency room. this could lead to other problems like being malnutrition. are you able to take vitamins while drinking water.
there are herbs that will calm your stomach. i dont know if this will help you but it's good to give it a try until you can find out what's wrong with you.
how long has this been going on.
the herbs you can try is
To calm that queasy stomach herbal teas made with ginger, peppermint or goldenseal work well and replace the need fluids after vomiting. Ginger sooth irritated membranes and helps with digestion. Peppermint will ease spasms in the digestive tract. Goldenseal increase digestive secretions.

i m going to private message you some websites that may help you. research your condition on the search engine, you might find out what's wrong with you.