He has SSHL — sudden sensorieural hearing loss. One in 5,000 will experience this. Hearing may return on its own or with the help of steroids. His hearing did not return. Many possible causes of SSHL, although identifying a reason is mostly guesswork. His may have been the high blood pressure that was not responding well to medication at that time. Since then, fortunately, the right cocktail of drugs was discovered to help his BP but his hearing never returned. Then, there was a series of problems and delays with a doctor. He is now in the care of a new doctor. More tests. Hoping to get some sort of resolution in April. Probably very expensive hearing aids that he will rarely wear although we have no choice but to try.