work oneself into a lather

work (oneself) into a lather

To become very nervous, distressed, or upset. Don't work yourself 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 worked herself into a lather about us leaving behind schedule.
See also: lather, work
Farlex Dictionary of Idioms.

work oneself (up) into a lather

 and work oneself (up) into a sweat 
1. and work up a sweat Lit. to work very hard and sweat very much. (In the way that a horse works up a lather.) Don't work yourself up into a lather. We don't need to finish this today. I worked myself into a sweat getting this stuff ready.
2. . Fig. to get excited or angry. (An elaboration of work oneself up to something.) Now, now, don't work yourself up into a lather. He had worked himself into such a sweat, I was afraid he would have a stroke.
See also: lather, work
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

work oneself into a lather

verb
See work oneself up into a lather
See also: lather, work
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • cast (one's) lot in with (someone or something)
  • cast lot in
  • don't cry before you are hurt
  • don
  • all in (one's) head
  • (I) won't tell a soul
  • cart before the horse, don't put/set the
  • don't get me wrong
  • bank on
  • banking