Hi, Sue, This particular thread started back in March, and Jim did say he recovered. There is another thread starting on the subject of singing technique, which is why I brought this one back to the top, rather than re-type all the advice and links provided last spring.

Because a singer's vocal chords, sinus passages, breathing, etc. are affected by so many different factors, the voice is very changeable, as you describe. The more techniques you use in protecting your voice and your health in general, and in training it in the correct way on a regular basis (just like doing other physical exercises on a regular basis) the more reliable your voice will be.

alice in montana