Some people go vacant when I start to talk about Mindfulness, but it may be because they don't really know what it is. Yes, it can be sitting in a dim room with incense, crossed legs and meditating, but it can also be many other things. I don't connect with this basic understanding of mindfulness as I struggle to 'switch off'. This is where a term Active Mindfulness comes in. When we focus too much on the past we can experience depression and if we obsess about the future we can experience anxiety. Mindfulness is the concept of living in the now, not thinking about anything other than the specific moment you are currently in.
There are many activities that you can engage in where you are only focusing on the task at hand; origami, Sudoku, colouring, puzzle. Whatever activity you enjoy doing that means that you are unable to think about the past or the future.
By living in the moment you are giving your brain a holiday, the rest it needs to deal with any negative emotions that may be floating around. Try and get into a habit of doing mindfulness on a daily basis so that you are prepared for when your brain needs a break from whatever may be going on in your lives at any given time.