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You are having hard moments with cough and chest pressure. These symptoms are the most common and may be triggered by the flu, common cold, or allergic reactions. They can also cause ear pain or a feeling of fullness due to the dryer air in the cabin. Before you can fly again or think of travel, you should prioritize a healthy and safe life. With resting, make the best of the situation by drinking more water and using a humidifier to relieve congestion. 

Weakness, frequent coughs and colds, and fainting can have various causes. These symptoms might indicate low iron levels in your blood, known as anemia. Feeling tired or light-headed are common sign of iron deficiency. You should eat iron-rich foods like spinach, lentils, and meat, drink plenty of water, and rest when needed. If these steps don't help after some time, seek medical advice as soon as possible, as it could be something serious that needs urgent attention.