What you are suggesting is vibrational healing which is the root of all spiritual and the majority of ayurvedic healing. But you want something audible and generated from the vocal chords of a human being. Now, if words help you achieve this, then use them.
Certain tones invoke responses in the body - in this case to heal itself. Here are a few intriguing links on the matter :)
Now, as we realize all things are a vibration of energy, which we come to that realization through knowing that everything has it's own wavelength, we come to understand how manipulating and stimulating (enhancing or decreseaing) certain vibrations (wavelengths) can really effect the physical, mental, and spiritual selves. And in this case, especially the physical :)
Of course with such treatments as sound/vibrational healing, it should be accompanied with typical medicines - natural or pharmeceutical. But that is up to the patient :)