In the last 6 months I don't think I've gone a month without having at least 2 mouth ulcers.
I've had a google, and it would seem they are only really cause for concern if the same ulcer lasts for longer than 3 weeks, which mine don't, but I've never suffered like this before.
Could be a sign of a B12 or iron deficiency.
Would you ask GP to run blood tests?
I know it's not life threatening, but they are bloody sore, tiresome and make me absolutely miserable