Don't lose your head.絕對不是你想的那個意思，而是一句在你慌亂的時候的一句寬慰的話，可以翻譯為不要驚慌失措。
還有另一個有趣的說法：
Don't get your panties in a twist.
直譯就是「別把你的內褲都打結了」，延伸意思是「別為了小事這麼焦慮」「冷靜點，不要那麼慌張」。它還有幾個類似表達，用法都相同：
Don't get your knickers in a twist.
Don't get your panties in a knot.
Don't get your panties in a wad.
看看老外聊天都怎麼用！
A:My parents are coming over，but my flat is a mess！What do I do？
我父母要來了，但我的公寓現在一團糟！怎麼辦？
B:Hey，don't lose your head，Calm down.
嘿，別這麼驚慌，冷靜點。
A:I can't calm down！They'll see how messy my place has always been！
我冷靜不了啊！這下他們就會知道我家平常有多亂了！
B:Let's just get the place cleaned up together quickly.I'm sure it can't be that hard.
我們趕快把你的家清理一下吧，我相信這應該不是很難。
A:It totally can be that hard！I mean，I can't even see my bed because of all the things I have stacked on it.
這可是超難的！我是說，我在床上堆了太多東西，根本連床在哪裡都看不出來了。
B:Where do you sleep every night then？
那你晚上都睡在哪兒呀？
A:In the bathtub.Where else？
睡浴缸裡啊，不然呢？