I didn't believe any of this when I first heard about it but I'm now a skeptic believer. He was able to explain, in detail, what he felt - both physically and mentally - and could name when they happened and for how long.
He underwent a bunch of medical and physiological tests as he didn't know what it was at first, mostly because it started to impact his relationship. I'm not sure he even knew about the whole thing until he started searching around on the web for his symptoms and came across others in the same neighborhood where it happened, claiming to have reported similar things.
I brushed it off at first as it seemed clear it must have been something else, but it didn't help that in literally every other aspect he's an empirical, grounded, down to Earth and totally intelligent person, an expert in his technical field, etc.
Still not sure where I stand on it as it's incredibly difficult to study or even justify scientifically. I'm still not even convinced it was "directed energy". But I do at least believe people who say they've been affected by whatever it was. It's certainly lessened his quality of life, whatever it is.