I am so scared and worried if something is wrong, doctor said lungs sounded perfect and oxygen levels were normal but these symptoms are draining me.

Cant take a deep breath in 
Feels like lungs aren’t expanding 
Tightness around throat and chest
Feel very shortness of breath 24/7
Intrusive worry
Feels like I can’t take a satisfying breath 


Been going through this since February and I am so scared over it