When you are overwhelmed, you probably have a mind that is FULL of thoughts, worries, concerns, fears, regrets, hopes, and so much more. You need to get all of these thoughts and emotions out of your head, and there is no better way to do that than writing it out.
Start a journal specifically used for your overwhelming feelings of stress, called a Worry Journal. This can be used as a place to vent about every single thing you are worried about. Think about what is causing you the most stress right now, and write it down.
Be honest, be detailed or vague, write it however you want. Don’t worry about how long it is, how long it takes you, grammar or spelling, or any other “rules” of writing. Just get your worries out in whatever way works best for you. Soon you will realize not just that you had a lot to say, but you have more clarity about why you have been so stressed and overwhelmed recently.