I had a bad head cold once. it took forever for my ear canals to drain. slowly they did, except one ear laged. the doctor prescribed a strong decongesant. that eventually worked and my ear drained with a slow pop.
I have a sneaking suspicion, because you describe to a T what I felt, that you still have a plugged ear. possible bolus of mucus that is harder now, probably infected. the doc needs to recheck his work.