Hello and welcome to HCM.
Thank you for your query.
Oral irritation or even ulcers are associated with many different conditions. But, in all other conditions, it mostly presents along with other symptoms. If you would have any, you would have mentioned them.
But from the information provided by you, I am assuming you have only this.
A deficiency in vitamin B9 and/or vitamin B12
normally presents with oral ripeness and irritation, and even ulcers in the mouth.
As you have your annual check up in a couple of weeks, all systems should be thoroughly checked then. For now, you could consult your Family Physician and start on vitamin supplements.
I am sure you shall recover at the earliest.
I hope I have succeeded in answering your questions, you could write back to me anytime for further clarifications.