Also, if you instead created the annotation as map annotation (rather than into a geodatabase), check to see which annotation class is currently active. If the currently active annotation class has been turned off, the newly created annotation will not appear.
From the "Draw" toolbar, click on the "Drawing" tab, the click on the "Active annotation target", then select the desired annotation class.
Also verify that the desired annotation class is turned on. From the Table of Contents, "Properties" > "Annotation Groups"