Hi,thank you for posting your query on health care magic.
I have gone through your query and can understand your concern.
Looking at your symptoms,you are probably suffering from
Allergic Rhinitis.
You are using the Metaspray since a long duration of time.Generally,it can be taken continuously for around 3 months.
I would advise you to have an
Allergy testing to find out which substances,you are allergic to ,so that you can take precautions to avoid those substances.
If still no improvement,then you can also go for
Immunotherapy,in which you are exposed to substance which you are allergic to ,in a gradually increasing order,so that you become Tolerant to that allergic substance.
Hops this answers your question.Take care.