Mouth Sores from chemo: When do they go away?

Any suggestions for mouth sores? Mine started a few days after my first infusion of Taxotere and Cyclophosphamide. Am using Magic Mouthwash consisting of lidocaine, maalox and benadryl with baking soda, salt and water rinse in between. Day 4 and no relief. For those of you who've had them, do they not go away until all infusions are complete? If so, I don't think I can handle it 🙁