Additional pro tips:

Some research indicates that vitamin D supplementation maybe preventative against cough and colds. Just don't overdo it. Look it up.

I drink coffee with a little sugar and vitamin D fortified milk. In the US whole milk is fortified with vitamin D. I don't do it intentionally for the vitamin D. I just like milk in my coffee.

I occasionally run a Vicks Hot! mist humidifier in my bedroom when I sleep. To counteract some of the dryness from central heating and AC. Ultrasonic and cool mist humidifiers release mold spores and bacteria. I don't use them.

I keep a window cracked for ventilation. And occasionally open my windows in the winter and summer for fresh air. And airing out.

Everything I mentioned you can do at the earliest signs of illness. Which may lessen or prevent you getting very sick while you do other things like pursue medical care.

P.S. I like plane Robitussin DM (dextromethorphan and guaifenesin) for cough and also as a phlegm expectorant. They also make a drug called Tessalon Perles for cough. But it requires a prescription usually..🫂