Maintain regular watering...

Be careful how much water you give your plant, as over-watering will lead to root loss. Leaves fall off suddenly, and within a few days all that's left are the stems. In general, the plant is not salvageable.

To save it, remove it from its pot, then turn the pot upside down and lay the rootball back so that it can dry out more quickly.
Pinch the heads of the stems often, to encourage new shoots to grow along the stems. This will produce beautiful, well-rounded, well-formed pots. This operation postpones flowering, but allows the plant to do more.