Those symptoms are just common signs of stress. Being too busy or thinking too much in problems can contribute to having those symptoms, which is why it's important to take some breaks.
Have a nice day! :)<span />
Pandemics, diseases which spread to most populated regions with a high degree of mortality, have been recorded several times in world history, the first being the Plague of Justinian in 541 CE. The Black Death, also known as the Second Pandemic, was one of the most catastrophic events in human history.
