Possibly you didn't even need antibiotics...is it sore, did you have a temperature or discharge? It could be a form of tinnitus, or menieres, or just one of those things, I periodically get a 'blocked' ear, with a weird ringing/buzzing or as you describe, crackling & popping. If the Dr says it's clear, I assume you don't have a build up of wax, so it probably wouldn't be helpful to pop some olive oil in there, although it wouldn't hurt either. I am sure it will clear of it's own accord, as mine does after a week or two xxx