[Matte]

I had a similar accident once. In my case was during a negative dive head-up to -3m in order to train frenzel in the pool. In the exale part on surface, just before sinking, I usually fill my mouth with air and descend. That time I was too late in the filling and my mouth ended up mostly full with water. Since my ears were alread reclaiming some equalization, I did the tongue piston (frenzel) without thinking too muck on the consequences.. the result was unexpected and despite I was confortable at -3m, once at surface again I could not equalize back to ambient pressure, with quite a pain in my ears (I guess the eustachian tubes were not completely filled with water, there was some air too that expanded back).
The only thing I could think of, trying not to panic, was to rush into the sauna hoping that a warm environment could have helped.. It worked perfectly and tilting the head to one and the other side I could pour the water back in my nose completely. I am not willing to try again but at least I got what efattah ment: surely few dives are necessary for me to fill the tubes completely. Pull the water out, still puzzles me.. I cannot bring a sauna to the seaside :-/ Matteo.