To some of us, especially in modern times, writing down our feelings, experiences or thoughts can be alien - even worrisome, as it means we may be confronting something that we would normally suppress.
However, I have found that jotting down, whether it is in the form of a written journal, a notes app on your phone, or expressing ourselves through art or poetry, it can help to elevate the burden of a busy mind. by forcing us to think on more of a single track, rather then an mess of unorganised thoughts and fears.
Hopefully you find, more often then not, once your thoughts are out there, it offers a chance of stillness and sometimes realisation, which has helped me many times in the past.