What to do if i think i'm losing my voice and i have a concert tomorrow, please help!?

Losing voice: Very sorry to hear that. This can be quite challenging because your voice is the key part of your concert. In this short a period of time, best to see a doctor who specializes on voice issues, called an otolaryngologist. This kind of doctor can look at your voice box, hopefully determine what is happening and give you appropriate treatment. Wish you the best...And...Break a leg!

Loss of voice: While waiting to see the e n zt specialist, try hoing into the washroom and steam yourself for 20-30 minutes, several times a day. Try gargling and drink tea and lemon frequently. Sleep with a vaporizer and dont forget the old reliable clear chicken soup.