I had the same thing, got a fever overnight and a bad cold to go with it. The next morning I pretty much couldn't hear out of that ear with the exception of a bit of an echo sound from high pitched noises. Went to the doc and was told it was an ear infection and given antibiotics, they lasted a week but the problem stayed. I went back and was told I have a perforation in my eardrum. Apparently I've just got to wait it out that it should get better on its own as long as I don't get it wet.
How long did it take for you guys to get better I miss surfing
also bit worried about the extent of hearing loss I can't hear a thing out of my left ear except those high pitched echo's.