If you have email notifications turned on for Facebook, your inbox can be flooded with messages. Me, I stick with just seeing my notifications when I logged on to Facebook. Let me show you how to stop the flood of notifications.
Click the arrow at the top of your feed and choose Settings from the drop-down menu.
Then select Notifications from the left pane.
Go to Email and choose Edit.
Untick the box next to All Notifications.
That should stop the influx of notifications.