As u r. Not having fever & x ray chest is also normal, most likely it is not infection. Your throat block & breathing difficulty is due to seasonal allergic which cause mucus plug in ur wind pipe & this is causing all the problems u have
Next Steps
Steam inhalation will help. U need mainly antialllergic tablets & mucolytic syp( for the thinning of mucus plug so that u can cough tot out easily & get relief)