Beside dizziness, your ears will be almost permanently blocked. The symptoms will worsen if you get on a plane with a cold or sinusitis, as mucus stagnates with increased pressure. Therefore, avoid taking a long flight if you are sick. Keep in mind that long flights can cause severe ear pain, loss of hearing, and even hearing loss. If you are healthy, chewing gum may help. The movement of the chewing muscles will reduce the load.