There has been days when unprecedented work comes along, I was not prepared and work place was not prepared. Fighting spirit comes into function. Fear is setting in. Unsure whether the day is even possible. A sudden turmoil throughout the system.
I am sure we have all faced days like this. It can be difficult but needs to be dealt with. This could happen at work or at home. Talking it over with somebody or even writing all that must be done, will help.
What has really helped me is deep breaths and deep thinking, truly, everything gets sorted. Shallow breathing may set in a panic mode. There is no need. Life always gets sorted and days get sorted. Be calm, be patient and take deep breaths, happiness will set in. Have a good day.