It appears that your immune system is actually overworking ad an aggravated response to external allergens like pollens, house dust mite etc is the cause of allergies.
What seems like an eternal flu
bug is actually sometimes severe house dust mite allergy
that needs to be diagnosed with either specific IgE blood test
or skin prick test by your Allergist.
Combination treatment with high-dose antihistamines and nasal sprays is the treatment. 20% of patients will fail optimal medical treatmen and immunotherapy
(subcutaneous or sublingual) is then the treatment of choice.