Its possible you got an inner ear spin from the actual dive you just finished....I have on rare occassions surfaced and found I was a bit queasy.....nothing within the dive standed out as a culprit to my uneasy feeling...it just happened,,,in each case the sensation would pass shorty on its own. I have heard were divers after surfacing might attempt an eqlz. to help 'un-stop' the ears, and in fact only one side clears causing a feeling of dizzyness for a bit.