This was covered in episode #603 of the award-winning science podcast Skeptoid: “Sonic Weapons in Cuba”. It confirms the “mass psychogenic illness” explanation. There was no Cuban attack. There are no sonic weapons. It’s an urban legend. Nothing to see here folks.

Mass psychogenic illness weaponized into Cold War propaganda, The US doesn't face any real threats, but that wouldn't support the most bloated military budget the world has ever seen, so what threats there are have to be wildly exaggerated. Or made up as in this case.