Trouble breathing in and chest pressure. last ekg and echo over a year ago. recent chest xray and cat scan shows heart is fine. 20 years old.

Detailed history: It sounds like you have a complex situation and have already had extensive testing. These little text boxes are not big enough to go through all the details, which is what a doctor would need to be able to help. You might consider a second opinion inbox consult here on HealthTap where you can share the records of your tests and have then reviewed. Possible causes include asthma.