What I got day after Christmas was sore throat, cough that was not productive, no fever. Felt like when I got COVID so tested for it. Negative. Cough became very productive lots of mucus to point I would vomit. Finally about middle of Jan. the cough went away, except when I laid down at night.
LOL...you’re describing what I’ve got to a “tee.” Laid down in bed last night and coughing hit. For quite a while. Each day I’m feeling a bit better, but it’s sure a slow recovery.