I was given a diagnosis of bronchitis yesterday at the e.r., and they gave me breathing therapy and helped me a lot. today as the day went by i started having difficulty breathing through my nose and my throat feels tight. i'm not sure what it is ?

Acute bronchitis is an infection of the airways which results in inflammation and often bronchospasm. It is typically treated with antibiotics and a bronchodilator and sometimes steroid inhalers. If your nose/throat are getting congested, this could lead to your symptoms. But, if you become more short of breath, call your doc or return to the ER for re-evaluation. Good luck!