get into a lather
To be very nervous, distressed, or upset. Don't get into a lather just because you don't think your job interview went well. I told Mom that we'll get there on time, but she's gotten into a lather about us leaving behind schedule.
get into a ˈlather,
work yourself into a ˈlather (British English, informal) get anxious or angry about something, especially when it is not necessary: Look, don’t worry! There’s no point getting yourself into a lather over this!The idiom originally described the heavy sweat that you can see on the coat of a horse that has run very hard as a mass of white bubbles, like lather, the bubbles produced by mixing soap with water.