 [ Symptoms ] what happens if my daughter missed her monthly allergy shot  my daughter is allergy doctor is office is closed until december 14th she was scheduled to receive her monthly maintenance shot around november 19th but the office was already closed what should we do now [ Disease ] it has many causes but mostly your sinus infection or poor oral hygiene is causing it try starting salt water nasal lavage and keep taking antibiotic till it clears up and for at least 5 days drink plenty of water if you are already taking other medications please specify as some times it is caused by other medications also