I am also having this problem, it started after I got done taken vancomycin, or possibility due to the other antibiotics I took before that, that gave me a really bad allergic reaction. It's been 2 months now and this throat tightning, nausea feeling, and mucus every day, every few seconds clearing my throat is getting on my nervous. I can't eat without feeling sick even though I feel fine, it's just my throat. Idk what to do, I do have anxiety and been taken meds for it for years so Ism if it's also cause by that. Ugh I need relief. I am trap in the house all day afraid to do anything because of this. I need help