Here are a couple of things. Eat yogurt - maybe some of the "newer" kinds like Activa might be better. Also - get plain yogurt (yeah - plain) and use it as a mouthwash. I actually eat plain yogurt everyday (no added sugar or artificial sweetners). You will taste it by using it as a mouthwash but just know it is not vanilla

and it will be fine. This tip was given to me by a 20 yr+ survivor who was on the AC versus CMF trial (and got AC and therefore horrible mouth sores and because it was a trial there was really no advice).
Also, if you think about pain in general - a pain reliever and ice can help (drink cold ice water or suck on ice cubes). Someone else on this thread also said pressing on it helped (and compression helps muscle/nerve injuries which is why one wraps an ankle etc). Remember the olden days when someone had a tooth that had to be pulled and they had an icebag on the area and a rag tied tight around the head (probably some logic there so if you do this Terri, please take a pix of yourself and make it a temporary Avatar (lol) - don't laugh too hard as it will hurt).
If this is your first round with the epirubicin, this will be the worst of mouth sores. I got them with AC and they were the worst with the first round and not so bad thereafter.
I will be thinking of you (and smiling - wondering if you have an icebag wrapped tightly around your head).
Try to have a nice weekend!