I have the exact same thing for two months. Two rounds of steroids and three antibiotics. Nothing seems to stop the drip other than benedryl, mucinex, and robutussin for cough which only seem to mask the problem temporarily. Waiting on my ENT appt.

I've got it, too...My pre-Covid sinusitis got much worse after the virus: constant PND (clear mucus) down the back of my throat, sometimes down into my chest. I can breathe, but my lungs feel irritated, sometimes like there's an elephant sitting on my chest. I've been doing NeilMed 2x/day -- first with saline + budesonide + mupiricin, now doc switched me to saline + gentamicin + desoximetasone + drop of baby shampoo. Finished 5-day course of prednisone. Nada. On 6th day of amoxicillin and no change. Sometimes I have full body aches, leading my doc to wonder if the syndrome might be viral. I take Gaviscon Advance at night (have to order from UK via Amazon) in case there's a GERD factor. Staying hydrated, but...OMG, it's so much worse in the morning what with the congestion and gag coughing. I just feel exhausted and sick. Weirdly, sometimes by nighttime, say midnight, I feel pretty good. Don't know what to do next but may try acupuncture and then, at home, EFT (tapping). Couldn't hurt. : ))