[ch4s3]

People build weird behavioral dependencies around nasal sprays in rare circumstances, but its not a real risk. If you take enough corticosteroids long enough you can have mild withdrawals after stopping but again its not really a thing to worry about.

Your doctor is right, corticosteroid nasal sprays need to be taken before the onset of symptoms to be most effective. They basally dampen the allergic response and if you already have a bunch of immune signaling molecules bouncing around its too late.