It seems to me - when people feel overwhelmed and unable to cope with the sheer volume of things on the go, that's precisely when the best thing to do is stop everything, get present, and get grounded.

To explain:

Stop Everything!

Really, we all know that 99% of the time we can stop whatever we are doing and have a little time out. That applies regardless of how busy we feel. The only time it might not apply is when we are in the midst of an extreme emergency. Even then, as Julius Caesar illustrated,  it may still be possible to stop everything to have a time out from the heat of the action. And, time outs are helpful: they provide relief from stress and an opportunity to re-energize...even if it is only a small amount of energy it could be a vital amount, when recovered.

Get Present!

While some folks do this naturally [see Comment], most do not. People get lost in time: they spend lots of time agonizing over undesirable things done and said in the past; they spend lots of time worrying about undesirable things that may happen in the future. Meanwhile, they miss out on the present...they miss the Power of Now.

Get Grounded!

Some things are urgent; some things are important; very few things are both. There is a saying, an adage, "Where there is smoke there is fire". When it comes to 'Time Management', this saying is wrong. When it comes to 'Time Management', the saying should be, "Where there is smoke there is fire...or maybe it's just a smoke screen?...or maybe that's not even smoke, maybe it's just a whole bunch of dust up in the air?" Metaphors aside - people who feel they are dealing and struggling with too many things will benefit from asking questions like: "Is this task really that important?" and "Are any of these things really that important?" Sometimes the answer will be "Yes"...but, that will not always be the answer.