Help how do you cure an itchy throat with coughing? how long does itchy throat infection lasts?

since yesterday I had bad itchy throat that would make me cough nonstop. Cold air cold drinks or fans would stimulate me to cough& get itchy. My itchy throat & cough was gone all day as I took robutussin for kids a dietary supplement thing. Very strong & worked! However tomrow I’m going to the doctor & won't retake that tomorrow so the doctor can see me coughing. I have a lot of pghlem to point I can’t speak have raspy. Voice. Here it’s super hot & I was driving with windows down in car & that made me sick.
Help how do you cure an itchy throat with coughing? how long does itchy throat infection lasts?
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