Michael,
It's not a cure, but was a help to my mother to use an over the counter vitamin called Lisine. I asked the doc first, and since it is a regular vitamin, no problem. We had to crush it and dissolve it to use in her feeding tube, since she couldn't swallow either. It is a great help in aiding canker sores, and those terrible ulcers on the tongue. And it is useful for people with cold sores, fever blisters, sun blisters, ect. We found it ectremely useful....one a day and she felt results within about a week. It's worth a try if your doctor is for it! Hope that helps a bit....good luck and keep the chin up!!
Brooke