I have been similar too for about a week, I'm still at work, was anxious, got angry with everything for a while, emailed my boss about why we shouldnt be here, still at work but calming down a bit now, accepting I have to be here, I don't want to because I can't control who comes and goes or what they bring with them but I can clean everything down, stay as safe as possible wash my hands and tell people to get the eff away, and pretend it's for social distancing purposes πππ
But like Steve I am now in the hands of Boris waiting for the shutdown to come, until then I have to work unfortunately, otherwise I am staying safe as I can
The only trick I have for helping to calm me down when I am anxious is to run my wrist vein side up under a cold tap, after a little while it seems to cool you right down, I swear by it tbh