I get ear infections all the time. My ears constantly itch & are also painful! Fluids tend to build up behind my eardrums, so I can't hear. When this happens my ears will also feel "full".
Do you have an ENT doctor? My ENT placed tubes in my ears 3 years ago. They helped my infections & hearing greatly. A test can be done to show how much pressure is behind the eardrums. It's usually done at the same time as a hearing test. Steriods help my ears & sinuses some, but have destroyed my bones.
Surprisingly ear problems aren't common in CF. I didn't have many ear problems until about 10 years ago when I had a Frontal Sinus Obliteration. It was suppose fix my severe sinus issues, but only made them worse! I have massive sinus problems even for CF. They make me misserable!
Sorry I can't help much. I just wanted you to know you're not alone.