royfokker, "ear beer" is a solution that is instilled into the outer ear canal, to prevent "swimmer's ear".
The whole topic of ear problems confuses an awful lot of people.
HERE is an essay I wrote some time back, trying to clarify the issues.
In general, a feeling of fullness and muffled hearing is the result of inadequate equalization -- either left too late, or incomplete. The relative vacuum that ensues in the middle ear sucks fluid out of the surrounding tissues, and may even break small blood vessels. Once the middle ear is full of fluid, transduction of sound is impeded and muffled hearing is the result. Unfortunately, there is no way to hurry the resolution of this. Some people (and some ENT docs) use oral decongestants like Sudafed, antiinflammatories like ibuprofen, or mechanical treatments like chewing gum, but the bottom line is that the fluid has to reabsorb, and that takes time.
Once your ears have completely healed and you go to dive again, pay very close attention to equalizing BEFORE you feel any discomfort at all. Some people find that pre-pressurizing their ears on the surface, even before they begin to descend, can help jumpstart the process.
If you have any pain at all, or if the muffled hearing persists past a couple of days, it would be worth getting an exam from a diving-savvy physician.