Definition of agah:

1. anxiety
2. worry
3. care
4. heaviness over possible future events.  

Note:agah is NEVER used to admonish us to fear God.

Strong's Definition of agah:

01674  de'agah deh-aw-gaw'

from 01672; n f; {See TWOT on 393 @@ "393a"}
AV-carefulness 2, fear 1, heaviness 1, sorrow 1, with care 1; 6
1) anxiety, anxious care, care 

Joshua 22:24 And if we have not rather done it for fear of this thing, saying, In time to come your children might speak to our children, saying, What have ye to do with the LORD God of Israel?
Proverbs 12:25 Heaviness in the heart of man maketh it stoop: but a good word maketh it glad.
Jeremiah 49:23 Concerning Damascus. Hamath is confounded, and Arpad: for they have heard evil tidings: they are fainthearted; there is sorrow on the sea; it cannot be quiet.
Ezekiel 4:16 Moreover he said to me, Son of man, behold, I will break the staff of bread in Jerusalem: and they shall eat bread by weight, and with care ; and they shall drink water by measure, and with astonishment:
Ezekiel 12:18 Son of man, eat thy bread with quaking, and drink thy water with trembling and with carefulness ;
Ezekiel 12:19 And say to the people of the land, Thus saith the Lord GOD of the inhabitants of Jerusalem, and of the land of Israel; They shall eat their bread with carefulness , and drink their water with astonishment, that her land may be desolate from all that is therein, because of the violence of all them that dwell therein.