This tip is going to dramatically cut down your stress level - work from only one master To Do list
Once you try this you will find that it is a very different way of working. If you think about it, right now you probably have a few voicemails on your cell phone. You might also have voicemails on your business land line. You've got some emails, probably have a To Do list, and may even have post it notes and notes from a meeting that have action items as well. So with all of all these competing sources, how are you going to know what's important and what you should be doing - today? How can you possibly know what is most important to accomplish by the end of today when you have all of these competing priorities scattered randomly across all these places? What I do is that I take absolutely everything and turn it into a task in Outlook.
If a client calls me and says they need something done I immediately capture it via my phone or Outlook (which synchronize wireless) When I get an email that is important and will take a fair amount of time I turn it into a task. And when voice-mails come in instead of letting them pile up and have 5, 7 or 9 to listen to I write them down immediately, turn them into tasks and delete them. When you use this technique you will now have one master list of everything you need to pay attention to. You can then use this as the context to prioritize everything that's on the list against each other.