Low oxygen levels and hearing loss

I have on four different occasions woke in the morning incoherent, dangerously loww oxygen levels and the hearing gone in both ears.  Three of the eppisodes my hearing returned by the second day, but the worst I spent five days in ICU remember very little of these days, and hearing did not start to return for three weeks.  And then it was slowly.  I have been to many Drs., neuro. ENT, pulmonary, and PCD.  And have found no answers to the connection low oxygen levels and hearing loss.