Penny: take a deep breath. Remember that it's not cancer until a biopsy says so. Everything Christine says is right on the money, especially the part about oral cancer usually causing no pain (and about quitting smoking, but everyone here will tell you that). She's also right about getting yourself to a well-qualified cancer ENT. You don't say where in California you are, but there are lots of them around, certainly in the big cities.
It's easy to drive yourself crazy with worry, which may help to explain all the anxiety symptoms. Use us as a sounding board and a way to relieve stress. We're all here for you.
Now take another deep breath!
Sending good vibes your way.