Your primary should take a look at what you have going on with your mouth. Mouth sores can have many causes but it would be a good place to start.
We don’t give out direct medical advice here on this site but many of us have been through things most folks can’t imagine. So if your primary finds cancer such as squamous cell or others, this would be the place where you can find help and advice to deal with the next steps. Go see your doctor and good luck.