Hello, I can understand your concern. Unusual taste in mouth is almost always associated with a systemic factor of health and is a symptom of that condition. Acid reflux disease can also cause bad taste in mouth as the acid is regurgitated in mouth in this disease. In addition, as you are having frequent chest problems, if they are associated with coughing, constant coughing can cause unusual taste in mouth. In addition, certain other factors such as gum disease, chronic sinus problems, side effect of medicines that you may be regularly taking can cause this problem. You can consult a dentist to look for infection in oral cavity and can discuss the side effects of medicines you are taking for acid reflux disease with your prescribing doctor. To find temporary relief in the situation, you can suck on sugarless flavored candies or chewing gums and can also start using mouthwash. To answer your vertigo question, you can have vertigo due to ear infection or problems in the head and neck region due to injury or infection. ENT specialist is right doctor to go to for this problem. He can check for infection in the middle ear and can advise further regarding the problem. I hope this information helps you. Thank you for choosing HealthcareMagic. I wish you feel better soon. Best, Dr. Viraj Shah