Breathing problem. What i need to do?

Since last one year I am facing breathing problem. Don't know reason it would be because of acid reflux, cough or weight. I had my chest scan, endoscopy of stomach also all seems fine found some inflammation in throat. My weight is 78kg and height 5.9. Which I gain in past few month might be I have taken too much vitamin supplements and esoga Rd for stomach. I feel cough in my throat all time but after examine through stethoscope nothing found. Mainly I feel breathing problem when I drive car, or bike if too much dust or hot air or in closed space. Also I did my nose n throat scan which found one small cyst in left side of nose. I use xylomist .1 drop which after 10min I feel better in breathing. Please suggest what I need to do?