Pressure in my ear. ~2 years ago i flew with a sinus infection. randomly since then it feels like my right ear needs to pop, but won't. what is this?

Eustachian tube : Eustachian tube dysfunction could cause the popping or blocked sensation. You should be checked by an ENT doctor to assess for fluid behind your ear drum. You may have an allergy causing fluid to build up and allergy medicines/shots may be needed as well so an allergist may be the next step after the ENT doctor.

Ear pressure: More than likely your continued feeling of ear congestion (feels like ear needs to pop) is a result of either allergies, a sinus infection or some other cause of fluid in ear. Things that you can try include a decongestant, irrigation of any waxy build-up in the ear or hot steam treatments using a bowel of hot water and a towel over your head. Don't use q tips, do consider medical evaluation.