I actually am drafting a d&d campaign at the moment in my favorite slytherin notebook. So yeah, I do often use a pen and paper. It actually helps me focus
I don't know if its "original" but I have written a story about a girl named Lyra and her stuggles as she begins to reach her upper teenage years and is faced with drama, coming out to her parents about her 'gender' and sexuality and all sorts of deep stuff, it went pretty well actually
I normally count to ten repeatedly while taking deep breaths, it helps since sudden change is what usually sends my anxiety into overdrive and the fact that the process of counting up to ten never changes calms me.