Stanley, I think it is too soon to judge if the ESD has failed, you are only 5 weeks post surgery. Prior to my ESD w/ shunt I asked my doctor what he considered a successful result from the surgery and he told me if it eliminated the vertigo or cut down the number of attacks it would be successful. I would call your doctor to let him know what is going on. If you start having clusters of attacks then I would be a little more concerned but 1 or 2 is just a bump in the road. I would not consider the ESD a cure, it just relieves some of the symptoms of Meniere's. FYI, it took about 6 months before my ear "settled" down, I didn't have any vertigo post surgery but I did have a lot of odd sensations. Did they install a shunt or did they just decompress the Sac?