@sprice After suffering severe mouth sore outbreaks for many years, I truly feel your pain. I always knew some outbreaks were triggered by certain foods, but avoiding those wasn't enough. Many years ago, one of my kids suggested I eliminate wheat from my diet as a possible culprit, and for me it worked.
My brother had similar outbreaks, and discovering his cause wasn't as simple, even after extensive allergy testing. He went on an strict "elimination diet" to discover his triggers. This worked for him.
Have you tried anything like this?

I have been there after surgery and had to go off my meds because it interfered with healing. Mouth full of sores could not eat or drink without horrible pain and lost 40 lbs. I have litchen plantus was diagnosed by dermatologist after biopsy. They finally started me on cyclosporine and it really helps but also started me on rhemacaid IV infusion which helps a lot too. So hope you feel better.