Could A Slap On The Ear Cause A Blocked Sensation And One-sided Eustachian Tube Dysfunction?

Hello, I had been slapped on my left ear by mistake yesterday and there was a T sound yesterday for quite a bit, no pain no bleeding no dizzyness, the T sound went of in a bit and now I feel blocked in that ear but im sure I can hear in the ear. Also when I pinched my nose and tried to blow air through ears the air was only going through my left ear and not the uneffected ear. what does this mean? Am I going to be deaf on my left ear? what should I do? Im a bit worried. Do I need treatment?