The best overall treatment is still lots of rest and plenty of water to keep the vocal chords (and the rest of you) as hydrated as possible. No matter what your voice problem is caused by. Still don't know what to do about allergies except avoid the allergans. (Medications seem to compound the problem, for me at least.) Used to work in a building where I must have been allergic to mold and fungus in the ventilation system. Got laryngitis every May for 3-4 weeks. Haven't had that problem since I left there 11 years ago. (Except for a brief, weird brush with it a few weeks ago.)

Bat Goddess