You can use ipratropium nasal spray
if it is available in your country. ( Atrovent)
If you have sneezing and itching also , it may be unrelated to IPF and oxygen therapy
. In that case antiallergy drugs like antihistamines ( oral or nasal ) will also be useful.
How are you taking hydrocortisone
, injection? nasal drops ? Or you mean corticosteroid when you mention hydrocortisone?