For how long this is happening?
Do you feel ear pain?
Do you feel facial pain at the same side?
Have you suffered from a bad upper respiratory infection recently?

Went to the doctor yesterday. Found out that I had an infection in the eustachian tube, it was probably connected to my allergies and i also had something like a flu. Thanks for the help anyways.

I guess you got your Eustachian tube blocked or obstructed because of recent cold (the most common cause is a "cold" upper respiratory infection). Sinus infections or allergies can also cause swelling of the Eustachian tube. In other words, a stuffy nose leads to stuffy ears.

Did you notice ear fullness or mild hearing loss?
What treatment did you get?

I did have mild hearing loss, and ear fullness, or more it seemed like my ears couldn't depressurize, they perscripted me with disophrol repetabs, I can't describe it, as my mother tongue isn't english i can't describe the exact effects, as i don't know the exact terminology. Sorry. What I know is that the medicine causes confusion, and sometimes even nausea. Thanks for all the help and effort by the way.

The Eustachian tube connects the middle ear space to the back of the nose. Its primary function is to ventilate the middle ear, ensuring that the pressure inside the ear remains at near normal ambient air pressure. The secondary function of the Eustachian tube is to drain any accumulated secretions, infection, or debris from the middle ear space. As Eustachian tube function worsens, air pressure in the middle ear falls, and the ear feels full and sounds are muffled.
Antihistamines and decongestants, are prescribed usually to treat this condition.