Thanks for your query.
As you are having eosinophilia
which may due to Allergic asthma
, dermatitis herpetiformis
,antibody deficiencies etc.
As you are also having GERD you should also rule out parasite infection as it can cause eosinophilia.
When anti allergic drugs do not work then corticosteroids
and interferon may help.
Visit your doctor and get stool culture, antibodies, biopsy to reach a diagnosis and discus about corticosteroids and interferon.
Hope it helps.