Then for the long term. Switch to Lugols mixed in clean water. If you have a 2% solution you work your way up to 20 drops in a glass of water. A 5% Lugols solution should be something like 8 or 10 drops.
If the Lugols works from the beginning without the Miracle-Mineral-Supplement I would just use the Lugols and skip the MMS. Lugols is something your body needs and can be taken long term.