Get something off your chest
Definition 1 of 1
Pro Tip 1/3Emotional Relief
Used when expressing feelings or worries to feel better emotionally. 
After I got off my chest how overwhelmed I felt, I slept better.
Pro Tip 2/3Informal Situations
Mostly used in casual or informal settings among friends or family. 
Can we talk? I need to get something off my chest about yesterday's incident.
Pro Tip 3/3Personal Topics
Often pertains to personal issues, not general information or small talk. 
He needed to get something off his chest about his feelings for her.