Suggest Treatment For Blockage In Ear Caused Due To Sinus Infection

I have a blockage behind my ear drum, impeding the hearing in that ear. This developed after a cold that included sinus and sneezing and coughing. The ear was washed by a GP, and lots of wax came out, but I still can't hear very well out of that ear. I am being treated with an antibiotic, but the series is finished tomorrow, and I still can't hear well on that side.I have an appt. with a specialist on the 26th of Jan. Should I try to go sooner? Will I need surgery?