Hi. I was drinking water with lemon the previous month and now My mouth has a greasy taste and my tongue is white.so, I stop adding lemon to my water 15 days ago. I tried cleaning my tongue but got it irritated. I went to urgent care and he told me it was stomatitis He gave me medication for 5 days. It s been 18 days since I got this symptoms and they haven t gone away. Please help!