Nyte and Out are so right,
If we let this, it can consume our lives. Its amazing how our Peace can quickly escape us if we let the addicts behavior influence our Serenity.
I know the toughest challenge for us as parents is what I call "the edge times." When our addicts are on the edge of recovery, or the edge of falling down fully into addiction. THAT has to be the toughest time for us parents to stay away. " sigh" Its much easier to accept my powerlessness during the certain times.
Try to let his problem go. If he is starting back down that road, nothing you can do will affect it either way. Only he can start and stop this. But on that note, only YOU can find your own Peace. No one can give it to you. So give yourself this gift and leave him to his HP and focus on your ability to handle your life and search for that place where its peaceful and you are not falling off the edge with him.
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Prayers to you both at this trying time.