Went to doctor with a little cough and chest discomfort. he said oxygen levels were good and diagnosed acute bronchitis. im scared that i cant breath?

Breathing is essential: Whenever you have a respiratory infection such as pneumonia or bronchitis and you can brief you may need to go to emergency room. You could get a respiratory treatment there such as a nebulizer with medications. And if you're doing okay at home I would recommend a coolmist humidifier. You can add Vicks vapor to the humidifier or eucalyptus oil.