One of the ways to deal with any overwhelming emotion is to find a healthy way to express yourself. This makes a journal a helpful tool in managing your mental health.

This study examined whether ruminative style moderated the effects of expressive writing.

Sloan DM, Marx BP, Epstein EM, Dobbs JL. Expressive writing buffers against maladaptive rumination. Emotion. 2008 Apr;8(2):302-6. doi: 10.1037/1528-3542.8.2.302. PMID: 18410204.

The effect of emotional disclosure through expressive writing on available working memory (WM) capacity was examined in 2 semester-long experiments.

Klein, K., & Boals, A. (2001). Expressive writing can increase working memory capacity. Journal of Experimental Psychology: General, 130(3), 520–533. https://doi.org/10.1037/0096-3445.130.3.520