In my humble opinion, if Phos. 30X worked so well, why not go back to it? Hahnemann says that the right remedy in too high a potency can be a disaster.

Why not put the phos. 30X in a bottle of water, give a sip once a day, shake the bottle before each use, adjust the dose according to his reaction to it. Always go back to what worked; and it's shocking to me that when something works in low potency, inevitably the homeopath wants to raise it. Let's hope that the 200C won't
spoil the 30X from ever working again, but I would give it a try.

Snoopy