If you again suddenly lost your hearing it could mean that the new bone that we replaced has either slipped or got displaced. It does at times cause giddiness if it touches the part of the inner ear which lies quite close to the foot of the new bone (prosthesis). I would suggest to continue only Vertin 16 mg thrice a day for three weeks more. You do need to be evaluated further to see if your ear needs to be checked for the problem you have. Checking the prosthesis after it gets displaced is a usual thing that is done, so don't worry. Consult your surgeon for further tests.