Chronic Mouth Sores - Inflammation Throughout Digestive Tract

I have had an issue of painful mouth sores for well over a year. They appear in my cheeks, the sides of my tongue and my gums below my front teeth. Today my tongue feels very raw. I have seen a Dentist, Periodontist, Endocrinologist, Rheumatologist, Oncologist and gastroenterologist as well as my family doctor over the past year. I have GI problems that have led me to some of these doctors but I have discussed the mouth problems with every one of them and no one can help me! On Tuesday I had a CT scan of my abdomen and pelvis looking for a tumor because of some troubling results from numerous blood tests. They did not find a tumor but found spots on my liver. I will return on June 24th and 25th for an MRI of my kidney and pancreas plus a test where they will put a tube with a tiny camera down my throat to look around. I was told that I have inflammation all throughout my digestive system. It is the oncologist that is ordering these tests because he's still concerned in spite of the good CT scan. He is the only doctor that I didn't really discuss the mouth sores with and I'm wondering if all the GI tract issues that I have couldn't be the same thing that is causing my mouth sores? Like some acid or something my body is producing that is causing it. Oh, I left one doctor out, I don't even remember his specialty but he did a biopsy on my mouth and that was clear. Do any of these symptoms together ring a bell with anyone? Also has anyone had a successful prescription or home remedy to heal or at least relieve the pain from these sores?