Sounds like you still have a fluid and/or pressure buildup behind your eardrums. Most ear infections start with the eustachian tubes not working well to properly equalize pressure behind the ear drum, so a vacuum develops, and pulls fluid from the membrane lining the middle ear space. The fluid filled space is a nice dark, damp area for bacteria to breed in. The antibiotic killed the bacteria, so infection is gone, but if the eustachian tubes still aren't working properly, the fluid may take a while to clear. You can try the Valsalva maneuver, where you hold your nose, keep your mouth closed and put pressure like you are blowing you nose. That forces air through the eustachian tubes, into your ears to help get air circulating and equalize the pressure.
Could be a couple of more weeks before you feel like your ears are completely back to normal, but as long as you aren't having any pain or fever, I wouldn't think it necessary to go back to the dr. I work in an ENT office, and this is pretty common.
DS - Feb 2010
DD - May 2012