Keep Calm and Carry On: that’s not how people felt as the second world war loomed. But maybe, as Trump stalks, that old slogan is finally making sense

It has become known as the “war of nerves”. An apt name for a jittery, jangling time in British history, consumed with fear of what may be coming, in which the sheer unpredictability of life became – as the historian Prof Julie Gottlieb writes – a form of psychological warfare. Contemporary reports describe “threats of mysterious weapons, gigantic bluff, and a cat-and-mouse game intended to stampede the civilian population of this island into terror”.

It all sounds uncannily like life under Donald Trump, who this week marched the world uphill to war, only to amble just as inexplicably back down again. But Gottlieb is actually describing the period between the Munich crisis of 1938 and the blitz beginning in earnest in September 1940. Her fascinating study of letters, diaries and newspapers from the period focuses not on the big geopolitical picture but on small domestic details, and what they reveal about the emotional impact of living suspended between peace and war: companies advertising “nerve tonics” for the anxious, reports of women buying hats to lift their spirits and darker accounts of nervous breakdowns. We did not, contrary to popular myth, all Keep Calm and Carry On. Suicide rates, she notes, rose slightly.

In the UK and Ireland, Samaritans can be contacted on freephone 116 123, or email jo@samaritans.org or jo@samaritans.ie. In the US, you can call or text the National Suicide Prevention Lifeline on 988, chat on 988lifeline.org, or text HOME to 741741 to connect with a crisis counselor. In Australia, the crisis support service Lifeline is 13 11 14. Other international helplines can be found at befrienders.org

Gaby Hinsliff is a Guardian columnist