Hate to break it to you, but loosing your voice means that you've really damaged it. I don't know about green tea, but there is a tea that is specifically for helping restore the vocal chords. It's called Throat Coat. I personally hate the taste, cause it kina taste like Liquerish, but it really helps. And if you wanna keep singing for a while u need to either stop shouting, or learn to shout the healthy way.
