to have a lot on (one’s) mind

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to have a lot on one’s mind (to be worried about many things)

E.g. 1:

A: Why are you so quiet? Normally, you can’t stop talking.

B: I’m sorry. I’ve got a lot on my mind at the moment.

A: What like?

B: Money worries, job worries, family troubles…lots of things!

E.g. 2:

A: Have you seen Simon lately?

B: Yes, I saw his yesterday. He seemed to have a lot on his mind. I’m worried about him.