Take out a blank sheet of paper, or open a new document, and for 15 minutes write anything that crosses your mind. Don't worry about it making sense. If you're like me, you'll have to do some grammar/spelling edits as you go along or else you'll feel like ripping your hair out by the roots, but try not to criticize the writing.
I find this helps loosen things up, and just seeing how much you can write down in that amount of time helps a lot.
I'm Seri, by the way. Hallo!