Could be a lot of things but that is a lot of the Covid checkboxes.  I had something similar for at least 7 weeks starting mid January.

Guessing Flonase, real Sudafed, maybe mucinex (have to choose between postnasal drip and breaking any chest congestion for cough), multivitamin, eat some Rolaid’s and maybe try a neti pot with the baking soda solution since altering the pH supposedly makes it harder for viruses to replicate.  Tylenol for fever and maybe magnesium for sore muscles.  My throat got so bad a couple of times I had antibiotics or tried the numbing sprays.  I have never tried the Vicks inhaling mask or the navage nose pump deal.