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As per your complain and presentation of symptoms, it points towards MAJOR APTHOUS ULCERS which are about 10mm or larger in diameter..
They are also a type of apthous ulcers or canker sores with a larger size..
As they are not resolving even after 2 weeks then you should take a Steroid course as when nothing is helpful in resolving apthous ulcers the final choice of treatment is taking Oral and topical
steroids..
You can take Medrol twice daily for 5 days..
Topical application of steroid based Oral gel has to be done..
In case of pain take an anti- inflammatory painkiller like
Ibuprofen (Advil or Motrin) for relief..
Apply topical numbing gel like Oragel..
Take a course of
multivitamin one tablet daily for 15 days..
Do warm saline gargles..
Gargle with 1:1 solution of water and
hydrogen peroxide..
Sucking ice pops can help..
Maintain hydration by drinking plenty of water..
Avoid hot and spicy food..
If the ulcers does not start resolving
consult a dentist for clinical evaluation..
Hope this information helps..
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Thanks and regards ..
Dr.Honey Nandwani Arora..