I feel this trapped air or pressure always on diaphragm in my neck and back sometimes chest all dr. say nothing is wrong but i'm scared of dying is it?

Panic attack: If you have been evaluated by your dr who reassured you that you are fine medically, then you may be suffering from a panic attack. Symptoms include chest pressure, shortness of breath, rapid heart rate and fear of dying. See your physician for a referral to a mental health specialist. Sometimes asthma attacks can mimic a panic attack b/c they can be assoc. W/ extreme anxiety.