(informal, figuratively) so focused on what one's doing that one becomes unaware of one's surroundings and oblivious to anything else, that one can no longer see the bigger picture

at best

(informal, figuratively, of a thing) to be all over the place / (informal, figuratively, of a person) to be all over the place, to be all over the shop, to spread oneself thin

(humorous) after a while, crocodile

(informal) to take a hit, to take a knock (to suffer a setback)

(informal) to have had one too many, to be the worse for drink, to be tipsy

(informal) at worst, worst case scenario, worst comes to worst

(derogatory) to elicit sympathy by being overdramatic and playing to people's feelings

to split hairs

(figuratively) to play someone's game, to play along with someone, to go along with someone, to get dragged into someone's game