have a lot on mind

have a lot on (one's) mind

To be mentally preoccupied with many things, often resulting in feelings of unease or agitation. I'm so sorry I made that stupid mistake—I've had a lot on my mind these days. Are you OK? You look like you have a lot on your mind.
See also: have, lot, mind, on
Farlex Dictionary of Idioms.

have a lot on one's mind

Fig. to have many things to worry about; to be preoccupied. I'm sorry that I'm so grouchy. I have a lot of troubles on my mind. He forgot to go to his appointment because he had a lot on his mind.
See also: have, lot, mind, on
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • have a lot on (one's) mind
  • with reservations
  • go hot and cold
  • go hot and cold (all over)
  • sexual tension
  • tension
  • worked up, be
  • be worked up
  • get worked up about (something)
  • get worked up over (something)