Hello there ,
Thanks for writing your query,
After reading your clinical history and your symptoms i suspect you have developed severe inflammation of the oral mucosa
It may be caused due to several reasons like deficiency or certain vitamins especially vitamin B12 and vitamin C.
Maintain good oral hygiene
by practicing regular mouth rinsing with lukewarm saline water or antiseptic mouthwash like betadine or chlorhexidine
start with multivitamin
supplements for 7 to 10 days and vitamin C lozenges will help in resolving the problem.
avoid alcohol , carbonated drinks , tobacco chewing
and smoking as these may worsen the area affected.
For other medical problems , migraine and sinus irritation you may need to consult a physician and get the evaluation done.
i hope this helps ,