v. preoccupy the mind of excessively; besiege; compass about; dominate the thoughts of someone
The practical thing is have something else to do, don't obsess on it all of the time.
Sentence in Classic:
It was pain enough even to think of him, whether she considered him in the distinctness of her waking thoughts, or felt the obsession of his presence through the blur of her tormented nights.
House of Mirth By Edith Wharton Context
She wanted to be clear of him, and especially of his consciousness, his words, his obsession with himself, his endless treadmill obsession with himself, and his own words.
Lady Chatterley's Lover By D H Lawrence Context
It must not be supposed that he was delivered from all those obsessions of the memory which force us, even when happy, even when satisfied, to glance sadly behind us.
Les Misérables (V5) By Victor Hugo Context
But as she sat there amid her guests, she felt the old ennui overtaking her; the hopelessness which so often assailed her, which came upon her like an obsession, like something extraneous, independent of volition.
The Awakening By Kate Chopin Context