Headache bitter mouth nausea and alot of gas?

Need more info: It is not feasible to provide a meaningful opinion without additional information and physical examination. However, a common issue for such symptoms is overeating. Try to reduce your intake of food and brush your teeth after all meals. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, low fat milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. 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.