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The pressure you are feeling in the ears is due to changes in barometric pressure when you changed altitude. Problems can occur in the Eustachian tubes and the ear can feel blocked. To open it you can try few maneuver - swallowing or yawning, chewing a gum. If this does not help then try doing Valsalva maneuver. In this take a deep breath and fill your mouth with air. Now pinch your nose and close your mouth. Try pushing the air out with little force and not too much. This usually helps in opening the tubes and taking care of the negative pressure. If still no improvement, then you need to see an ENT specialist for an ear examination and further treatment like need of decongestant.
Hope you were able to take care of the ear pressure by the maneuvers at home.