Someone with medical background please?

Just curious as to what I might have. Yesterday morning I woke up and my ears felt plugged up and everything sounded muffled. as the day went on it went to only one ear. Loud noises and people talking make me feel like my head is going to explode. No other symptoms really, just congested feeling in my head and a slight stuffy nose. Do you think it could be sinus related? The stuffy nose makes me think that it is not an ear infection (although it is not really that bad). I just do not know what to take. a sinus and allergy decongestant pill did not help yesterday.