I had something like that once, except i think it might have just been an ear ache, but one ear was completely blocked up.
Warm up some olive oil, lie down on your side so your plugged ear is facing up, and pour a little bit of the olive oil into the ear. If its a serious pressure thing it will hurt like shit when it breaks the seal, but itll feel better after that for sure. Or if its swimmers ear get some meds or something..