I hope you are doing fine now and all your ulcers have disappeared. I can understand the pain as even i had suffered. Anyone who gets it can cure it with these home remedies i can assure it works great as i have been following few of these tips myself especially the coconut oil tip.
everydayroots.com/canker-sore-remedies
Should the NHS charge for such things?
Book Title by Their Authors (Parlour Game)


and read that some people have problems with this foaming agent.....