When we have BIG feelings like anxiety, anger, and sadness, or when we are just feeling overwhelmed, we tend to get stuck in our head. Our fight or flight reactions are triggered and we start to narrowly focus on whatever caused the problem or the pain.
This can be a healthy reaction to things if the problem is we are being physically attacked, but thankfully modern life is not as often like that. Instead the best thing we can do is come out of that mental state, so we can think with a clear head again.
The 5, 4, 3, 2, 1 Method (not my invention) can be helpful with this. It involves using all five of our senses to reconnect us with the world outside of our head. And of course if you lack one or more of these senses, feel free to adapt it how you see fit.
The idea is to acknowledge 5 things you can see, 4 things you can touch, 3 things you can hear, 2 things you can smell, and 1 thing you can taste. If I am in a position where there is not much around me to see or smell (such as laying in bed) I will think about things I encountered that day.
The benefit of this technique is to remind you that the rest of the world exists, and that it isn't falling apart. It also takes time to run thru the process, giving our mind-body a chance to slow down the release of those nasty hormone chemicals.
(More about those chemicals here!)
I like to not only name the object I can sense, but also think about the object. For example if I see a chair, I like to think about why the chair is shaped the way it is, who could have designed it, what I like about it, why we have chairs at all, etc. By the time I am done with this I am curious about the world again, and not lost in my own problems.