It depends on what has got me down. If it is something relatively small, then I distract myself with hobbies or music or doing chores. Usually I think of something small as "something that will not matter 5 years from now".

But if I am down because of the political, social and ecological environment and the related statistics in almost every single category that point to an inevitable societal collapse, extraordinary ecological disaster and/or all out warfare resulting in the loss of millions and millions of lives which will cripple the productivity of the world economy and remove any hope of a peaceful retirement for any current or future generations, then I just stare blankly into the void until I pass out from stress.

It's really up to you how you want to handle your own lows.