Gern, two sites in paticular that will give you lots of solid information on how a singer can protect the voice:
University of Pittsburgh Voice Center:http://www.upmc.edu/upmcvoice/

Center for Voice Disorders at Wake Forest University: http://www.bgsm.edu/voice/medicine_vocal_arts.html

Explore those two web sites completely, and you should have alot of information to make changes that will help save your voice.

Thanks for doing the thread link, Mary.

Alice Flynn