Hello,
Hyzzar may have a side effect like stuffy nose. You had congestion already due to allergy. Congestion aggravates the ear pressure in the flight.
You can feel the ear pressure problem more during take-off and landing of plane if you have allergy, congestion, sinusitis.
Sometimes this problem may persists for few days after the journey.
You can try some remedial measure like-
chewing gums, yawning which open up the blocked tube
If yawning and swallowing are not effective, you can unblock your ears as follows:
Pinch your nostrils shut.
Take a mouthful of air.
Using your cheek and throat muscles, force the air into the back of your nose.
When you hear a loud pop in your ears, you have succeeded. Do not try to do forcefully.
You can use decongestant nasal drop to clear up congestion.
If problem persists you should contact ENT specialist for further management.
If you need further clarifications, I will be happy to explain you.
If you find this information helpful, please press ACCEPT button. Bonus is appreciated.
Your Positive Feed back is very important to me. Thank you for contacting Just Answer.