Thank you for your query at DoctorSpring.com.
The cause of your itch and discomfort seems to be from eustachean tube dysfunction. Eustachean tube is connective tube between ear and behind the nose and is located where your itch seems to be. Abnormal closure of eustachean tube causes pressure changes in ear and can cause itching. This tube may get blocked because of excess secretions which occur when you have an allergy. So nasal allergy may cause nasal secretions which may in turn block this tube.
Usually it may improves with anti-allergy medication. Valsalva maneuver(trying to blow out air with closed mouth and nose) will also helps.
You can use Mometasone (Metaspray) nasal spray, in consult with your doctor. This is more effective in allergies. You can use this nasal spray for 6 weeks.
Also you can do steam inhalation regularly, about 2-3 times which will help clear the blockage.
Hope this helps. Feel free to ask if you have any further queries.
Dr. Sunil Jalan,
MBBS, DLO, MS(ENT), DNB, DAA.