Worst PND I've ever experienced...

Olivia • Happily engaged and expecting our first baby♡
20w6d pregnant, with HORRIBLE post nasal drip. I'm constantly spitting stuff up, and my coughs are dry, effecting my breathing. I have to be at work in a few hours (senior caregiver. I don't want to be coughing and hacking up in front of my patients) is there anything I can take to subside it while I'm there? I've done the netti-pot already. TIA!