Lemon juice is actually to harsh on the vocal folds (cords). Eating an apple is better and safer. Also, inhale hot steam like over a pot or on a personal vaporizor or something for ten minute increments, 4 times a day. Drink Throat Coat tea with honey, you can get it from GNC. Drink lots and lots of water. REST your voice. Most importantly, you need to get a better vocal technique. One that causes less strain on your vocal cords and frees up your voice. I recommend you getting a good contemporary voice teacher or ordering Brett Manning's Singing Success program. It's working wonders for me. I hope this helps.
God Bless,
Brian
