After bunch of tests in Doc's office the diagnosis is labyrinthitis. Basically, the recovery consists of two processes - actual healing of damage and brain retraining itself to compensate for lost/diminished function (whether it is lost temporarily or permanently). While former may take three months, six months or never, brain retraining greatly improved by staying as active as possible. I should be functioning normally in another two to three weeks.
Good luck to me.
SF