Hi.
Thanks for your query.
One month is a long time to suffer. You have
painful rash under the tongue, fever, diarrhea and upset stomach.
These indicate that you are suffering from enterocolitis. In this condition the oral cavity shows changes of
vitamin deficiency as the intestines can not absorb the essential nutrients and vitamins necessary for integrity of the mucosal linings.
I would suggest you the following:
Continue the treatment as per your Dentist's advise.
Consult a Gastroenterologist for clinical evaluation and
colonoscopy and other tests as may be necessary.
Take a course of antibiotics,
metronidazole, probiotics and Therapeutic Doses of Vitamin A and D to be continued in the form of Multivitamins.
Take an opinion of an ENT Surgeon also.
I hope this answer helps you.