I think the GP has a point: ideally, you'd have unaware Covid19 patients as a control group, to see if this is psychological or physiological. Those aware they

I think the GP has a point: ideally, you'd have unaware Covid19 patients as a control group, to see if this is psychological or physiological. Those aware they had Covid19 will fear all the known-unknowns around Covid19. Those who don't think they had it wouldn't have stressed about it at all.