The attacks also happened in China, Russia, and elsewhere. It started in Cuba, but isn’t limited to a particular geometry. It does seem to be limited to US agents and people in their immediate vicinity.
I have a much higher skepticism of self reported symptoms like this than the average person. I know a lot of hypochondriacs personally, so that may be a factor in my judgement. I think the human brain is excellent at coming up with little stories about how we are victims of bad actors.