1) 머리를 좀 비어야 될 것 같아요. 2) 스트레스 좀 풀어야겠어요. / 스트레스 좀 풀고 싶어요. Literally translated, it means: 1) I think I need to empty my head. 2) I need to relieve my stress. / I want to relieve my stress. I tried to imagine how I would say it myself. Hope this helps!