hi there,
go call you physician or dentist
and ask for a prescription of benadryl, maalox,
and lidocaine. It is commonly known as the "magic mouthwash" and I used to prescribe it all the time for patients going through chemo or had systemic diseases that created chronic apthous ulcers (aka canker sores.) If for some reason you can't get to the dr., use the combination of equal parts liquid benadryl and maalox (or mylanta) gargle and swish for 60 seconds then spit..