One thing I do when I am feeling sad is....
cuddle with my marshmallow animal pillows!
Listen to upbeat music that I like and suits my mood, while drawing. I draw while focussing on the Lyrics and sing along while my hands work. There's not enough space in my head then to overthinking. My head is empty and I forget my worries.
@StrawberryLK
same !
look at my christmas tree.
Eat ice cream :/
Hold someone I love close to me.
think about the things that made or makes me happy. i watch netflix, youtube, message a ton of different people so everything is different and is never the same.
Draw comic strips about how messed up I'm feeling 
Hug my cat, put on sad music, make hot tea/cocoa, call myself every horrible name in the book, think of every mistake I ever made that has hurt others and would justify my present punishment :(
Music, draw or play with my cat.
I just watch nature around me . Trees , water, sky, birds, hills, or the pictures of it. Helps a lot to calm myself.