There is some kind of cold going around that lasts over a month.
I tested for Covid and it was negative. My son had the same cold and the dr tested him for Covid, RSV, and the flu and they all came back negative. IIRC he got tested for Covid a couple times, too. All negative.
Whatever it was my partner caught from his grandson caused us to be ill Jan. to mid April 2023 and again that fall in all October. We both had a severe cough which had a lot of mucus coming out. I coughed so hard sometimes I was near vomiting. I may have damaged my right optic nerve from the severity of the coughing. I also considered I had bronchitis. Does this sound like your kind of cold?