Why do my ears hurt?

So a while back ( August) I travelled and travelling back before the flight I caught a cold
A sinus infection basically
And I thought I healed it but flying back my ear was aching a lot and basically I guess a lot of fluid built up and when I came home my ear was blocked. Felt like water was in there and I had a hard time hearing. That went away but we wanted to check my ears. I went to the docs and turns out had a lot of fluid so the doctor gave me meds for a month and such And went for a check up he said its all good but I can do an ear pressure test to make sure.
Now (December) both my ears feel clogged, not fully but a bit and the right one I have a dull pain. Not my left one which had all of the issues.
Should I just go back to the ENT? Or do I wait after Christmas?
And the ears hurt more at night I don't know why
Why do my ears hurt?
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