> ..the symptoms began as an intense feeling of pressure, which started in the torso and radiated up to the head and neck. Then there was nausea, followed by a “high-pitched squeal.” Taylor raced to a bathroom to vomit before collapsing unconscious on the floor.
> Once back in the United States, Taylor was diagnosed with a traumatic brain injury.
>Taylor remembers confronting a tall, muscular man with a military bearing acting suspiciously across the road from the consulate residential complex. After a brief exchange with Taylor, the man responded with a strong Russian accent, shutting down the encounter and running off.
>Taylor did not hesitate in confirming that Gordienko was the suspect skulking around outside U.S. consulate housing.
Gordienko being "Egor Gordienko named as senior member of cell of Russian agents who tried to kill former Russian spy in Salisbury" https://www.telegraph.co.uk/news/2020/02/25/fourth-russian-a...
Doesn't sound like a random headache to me.