You may have inner ear dysfunction called Eustachian tube dysfunction. This is where it kind of closes in on itself. I had this and oh my oh my oh my. It's bad. I had headaches, ringing in ear, ear fullness, decreased hearing, vertigo, nausea. I also went to an ENT. I guess this can happen after a virus. Mine crops up now from time to time with my last bad episode about 2 years ago. What the ENT told me to do for that inner ear issue was what is called reverse ear pops. Hold your nose, blow. Your ears should pop. Do it several times at a time and often. this does help to clear my ears.