Thanks for posting your query.
There is high possibility of sinusitis and allergic rhinitis
Presence of nasal blockage and running nose suggests the diagnosis.
You should also consult with ENT surgeon and internal medicine specialist simultaneously.
As such there is no correlation between vitamin D3
& B12 deficiency and development of mentioned symptoms.
You should go for x ray PNS view along with complete blood count
, absolute eosinophil count
and IgE level.
You should take complete antibiotic course along with nasal decongestants.
You should also take mucolytics along with steam inhalation.
Hope that helps.
Dr. Mayank Bhargava