Try Stretching the Jaw. Some people are more sensitive to pressure changes in the air. Swelling inside the ear canal can cause a loss of hearing that may result in sounds breaking up in a crackling noise.
Deep Coughing: Start by taking a deep breath. Hold the breath for 2-3 seconds. Use your stomach muscles to forcefully expel the air. Avoid a hacking cough or merely clearing the throat. A deep cough is less tiring and more effective in clearing mucus out of the lungs.
Make the coughs short and sharp. Push on your belly with your arms as you cough. The first cough brings the mucus through the lung airways. The next coughs bring it up and out. Inhale again, but do it slowly and gently through your nose. Do not take quick or deep breaths through your mouth. It can block the mucus coming out of the lungs.