Take a nap or just cart yourself off to bed or the couch for even thirty minutes. You might think it a strange idea but shutting down your brain in this way even for just a short while will absolutely help you recharge. Note: if you fall asleep almost immediately, that is a surefire sign you are over tired and need to consider how you might get some more sleep in general.
Prioritise. Work out what is really important and when I say really important, I mean really important. Does cleaning out the laundry cupboard or washing your house windows really have to be done today when you have so much going on? Could it not wait if your day is crammed full? What things are actually really, really important and do only those things. Making a to do list can be very helpful with this too.
Get outdoors. Sometimes when we are inside alot that feeling of four walls closing in on us can actually begin to feel like it really is happening. Stepping out into the sunshine, or even the rain, where you are under a big open sky and can take in all around you really helps.
Exercise. Go for a brisk walk, do yoga or dance up a storm to release some feel good endorphins and take your mind away from the pressure it is feeling. Good for body and for mind.
Allow for some 'space' in your life to do absolutely nothing. If you are scheduled to the hilt all the time that is a path to anxious and stressed feelings becoming very strung out and prolonged. It is vital that we allow ourselves time in our lives where we simply have nothing on and can then choose to do whatever we what with that time - at that time.
Live in the present moment. Thinking too much into the future and of all the things you need to do (or think you need to do) often creates feelings of worry. All you have is this present moment and to live your life fully you must be in that moment and doing what you are doing with care and love.
I hope you find these helpful. What helps you when you are feeling overwhelmed?