Software company founder John McAfee was taken to hospital on Thursday after being denied political asylum in Guatemala.
McAfee told The Associated Press that he suffered chest pains overnight but didn't believe he had a heart attack.
A government doctor said he appeared to be suffering from high stress.
More top news
Islamic State poses as great a threat to Britain as the IRA during its bombing campaign in the 1970s, a watchdog has said.
Turning colder with showers in the west and windy for many, with severe gales in exposed northern and western parts.
The elderly woman's son complained to the council that his mother had been deprived of her liberty in an 'unprecedented' legal case.