That's a very interesting idea. Isn't overactive fight/flight linked to quite a few mental conditions? Maybe the psychology folks here will know more.Completely different kettle of fish but whilst browsing another forum(sad as it was about BA flights) they were anecdotally talking about the impacts it’s had on crew who have come back from furlough and started working flights which are staffed by fewer staff than pre-pandemic currently with varying loads. Staff sickness is up and general well-being is dramatically down even after people have had “x months off” that people are suddenly back into different work patterns with different work pressures than they’ve experienced in maybe up to 2 years. Is it a fight or flight(pardon the pun) response from peoples bodies and minds that is affecting lots of different industries and walks of life in different ways
Add in stress, lack of exercise during lockdown, overwork, and a number of other factors which might play a role, IMO.
One other potential angle is that immunity might be low due to lack of exposure to viruses during lockdown and social distancing etc.
Maybe people are getting knocked sideways by bugs that they would normally shrug off, especially if being mentally rundown is affecting the immune system further.