What you heard is true it is difficult to clear the fluid from the middle ear once it has accumulated. I would advice you to stop the decongestants, you can try taking oral mucolytics (such as bromhexiene or ambroxyl), steam inhalations and saline nasal drops. Also, try blowing your nose gently by closing the nose and mouth tightly (Valsalva Maneuver
) for 2 -3 times a day. Drink plenty of warm water.
Any more doubts you are welcome.
Dr. Naveen Kumar