Start tapping on yourself using 2 fingers, tap on any or all of these points.
Tune into your body and ask: If there was a colour that I right feel now, what would that be? Where in my body do I feel that colour and the feeling of overwhelm? Tune into that area in your body and pick up on any other energy / feelings that may be there.
Now ask yourself: What colour do I need to feel safe right now? Think of that colour surrounding you like a comforting, soft, safety blanket, while you breathe deeply in and out for a count of six.
Practice and use this, so every time you feel overwhelmed or anxious, you have a strategy to calm and help yourself.
Children can benefit from this too, so teach them what you have learnt so they can discover for themselves how they can regulate their feelings.
Read more on overwhelm here and more on EFT here