on one's mind
- be in one's general thoughts, contents of one's mental space
Wiktionary
adj
- In one's thoughts, especially persistently or recurrently.
“With my mind on my money And my money on my mind”
“Oh, Ophelia You've been on my mind, girl, like a drug Oh, Ophelia Heaven help a fool who falls in love”
- Causing worry or preoccupation.