Getting over ear infection. Fluid gone. Feels like inflated balloon still in ear canal...Finished zpak antibiotic?

Be patient. The medication stays in your system for about 2 wks even though you finish it in 6 days. It can also take several more weeks for the residual fluid to be replaced by air. There may be a transient period where the eustachian tube does not function properly and leaves a vacuum like pressure in the middle ear. By 3-4 weeks from the start of treatment most will resolve.