There are a lot of things to do and I'm not sure you'll find any single technique to get organized and stay focused.
But...
- Do list the things you have to do. Several short lists will be needed (today, later, inbox == to be sorted out, etc...). Review these lists once in the morning, and then in the evening. These related posts are worth a read: The Taste of the Day and The Trickle List
- Timeboxing: allocate time in your calendar to get the tasks done
- As suggested by harriyott, switching off email is kind of essential too!
