What Causes Unusual Taste While Burping And Constipation?

My daughter complains of her burps tasting like beer or smelling like yeast or beer. She doesn't drink. She has been sick with stomach problems and intestine problems and also eats ice constantly. She stays constipated all the time. She has a lap band which is doing her no good, but making her throw up. her stomach craps and she lays in the fetal postion at all times. Please help