Have you ever tried one of the OTC steroid nasal sprays, along with your favorite antihistamine, for your hay fever? Rhinocort has budesonide in it, and studies have shown it can help prevent or lessen Covid19 symptoms. I don’t have hay fever, but I have chronic congestion and post nasal drip, and the steroid nasal spray I use, works wonders. And they don’t cause rebound congestion like the non-steroidal sprays do.
I usually try the generic version of Allegra. The main thing is anything I take has to be non-drowsy since my job requires driving from location to location.