I started having breathing problems after having acidity even though my acidity is gone i still have a blocked nose and still have difficilty breathing?

The difficulty breathing from reflux is different from the upper airway difficulties. The nose blocked may be due to cold or allergic changes because of dust of whatever type including pollen. It is important to keep dust down and see if that helps. The acidity did not cause the blocked nose and the difficulty breathing you had then may have been due to reflux into the wind pipe from the food pipe