Sternum feels tight little ache can't seem to fill my lungs also aches when i lean my head back and sometimes makes me cough ?

Pleurisy: Hi, it seems that you have Pleuritic chest pain which could be due to inflammation of rib cage or lung. Please see your provider for further evaluation. Feel better soon.

Bronchitis????: Sounds like you have broncho constriction due to some acute chest and throat infection. See a MD, you need antibiotics, inhaled bronchodilator +/- oral steroids for couple of days