A simple shortcut to managing your energy thoroughout the day: Be proactive in the morning, be reactive in the afternoon.
Turning this to meetings, try to put all but the most important meetings in the afternoon. For email, do not even look at your emails until at least 10am, preferably midday.
This is will allow you to block out your mornings to do actual work (yes, you should put this on your calendar to protect from time stealers - other people's meetings). Remember you do not get paid to answer email or schedule meetings.