Welcome to HCM,
I am happy to help you today,
You have high Eosinophil count
which was asymptomatic 11%,You should understand first what are common causes for this, Allergic Asthma,rhinitis, parasitic infection
, drug allergy are common causes there are less common causes which come in picture once we rule out these causes.
You have been treated with antihistamine and nasal spray for allergic rhinitis
you said asymptomatic?
You should get stool R&M to see if there are any parasites, roundworm, hookworm,pinworms which can be easily treated if present.
Other thing you need to do is serum IGE level to see if there is allergic component in it and job's syndrome.
You should see if you are taking any drug possibility of allergy ?
if you have symptoms and exposure to filaria.In which eosinophil count is high and antibody to filaria and a clinical response to diethylcarbamazine
Please discuss with your treating doctor.
Hope nothing serious is there and you respond to treatment and get back to job.
This information should be useful to you.