I work call center too so know your pain. My doc says whispering is harder on your vocal chords...so just don't talk. I was goint to tell you to shut up but don't know you well enough to say that. Drink until you're floating. Hot, cold doesn't make a difference. When I know my voice is straining I come home and don't talk to anyone. I just make sure I've had at least 3 16 oz bottle of water a day. Good for kidneys too by the way.
Oh..love your feathered start. Good think no voice does not affect sewing!