i don't know what kind of ear drops you are using. or your diagnosis but a clogged ear and muffled hearing can be caused by a combination of any ear drop combined with an ample supply of liquefied earwax. this may need to be lavaged (irrigated out) or suction out by your doctor again assuming your ear is currently not painful.
how long does it take for ear drops to take effect? . i was diagnosed with an ear infection was prescribed ear drops and now it seems like my left ear is under water everything is muffled.