Realization does not immediately create a complete lack of suffering. Realization is just that. A realization. It doesn't take away your feelings, your personality, your unconscious motives.
Realization is an opening into deeper seeing. It is an addition to what you know. It does not destroy proclivities or attitudes of long standing.
There is more work to do after realization. What you have is a new position to see from. A new perspective with which to view life and examine attitudes. In time, yes, suffering will diminish. It will diminish as situations, reactions and perspectives are re-examined in the light of realization. Realization is not an end point. It is the beginning of the possibility of real change.