Sometimes my breathing is very shallow and i have to really focus on breathing deeply throughout the day. what would cause this? fatigue?

Reflux: Some people suffer from reflux that is not obvious to them called "silent reflux". Some symptoms are dry cough, hoarseness, throat pain and breathing problems. Some people also describe "air hunger" from breathing through a smaller air space in the back of the throat (due to swelling from acid damage). Try stopping caffeine, alcohol and late meals and consider otc Famotidine (pepcid) twice per day.