I have basically the same symptom, however the reason may be different from yours. For me, If I remember right, is because the oval and-or the round window has been stretched. I did this when I pulled an ear plug out without releasing the vacuum behind it. My problem started a couple days later, did you do anything to your ear in the last few days?
bsmsl is probably right, the odds are that it's an infection. Either way you should see a Dr soon.
It sounds like a possible sinus infection. I suggest that you see you doctor soon.
Feel better and
have a blessed New Year.