Alan Shepard found a cure, for himself at least:
In 1969, he checked himself into a Los Angeles hotel under a pseudonym to undergo a new and, at the time, risky operation to correct his inner ear condition. The surgeon successfully implanted a small tube in his inner ear to drain the fluid away.
“I finally found a gent who corrected my ear problem surgically, and after Nasa looked at me for perhaps a year, they decided that I was well enough to fly again,” Shepard explained in 1991.
“In 1969, he checked himself into a Los Angeles hotel under a pseudonym “
Probably a felony today.