I always feel a vomiting sensation after drinking water. what might be the reason?

Too cold, too fast: If the water is too cold and/or you drink it too fast, it may induce spasm of esophageal muscles. Slow down and see if that helps. Wish you good health! - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex, if you have sex.