Decongestants are your friend, it will clear the congestion in your sinuses and ears. It will also help finish off whatever infection may still be there. Personally, I'd call the doctor for another round of antibiotics because it sounds like the infection isn't dead yet.
If you like herbl alternative to OTCs, ginger root tea. Cut about a half inch square of ginger root, drop in the kettle and bring it to a boil. It's great natural decongestant and it kind of sweet so taste before adding any sugar.
Hugs-
Kell