If you want to be a good poet,....

...read the psalms. For instance, you can't beat how the Psalmist in Ps. 55 expresses his agony and distress when he says in v. 3, "I rock with grief."

Also, this is heart-wrenching:

For it is not an enemy that reviled me –
that I could bear –
Not a foe who viewed me with contempt,
from that I could hide.'

But it was you, my other self,
my comrade and friend,
You, whose company I enjoyed,
at whose side I walked
in the house of God.

Even the line break between "at whose side I walked/in the house of God" lends weight to the sense of agony.