Breathing Issue. Will be appreciated.

I am having shortness of breath and feeling like unable to exhale properly. Everytime I try to  have a feeling of yawning a lot and then after yawn I get relaxed. I got my chest xray, ecg, cbc as well , all are normal. My blood pressure and oxygen saturation are also normal. I don't have asthma or pneumonia as well. In cbc report individual EOSINOPHILS count is 8.6 in range( 0 - 6.0). Although absolute EOSINOPHILS count is in between range. This problem was ago as well but not bothered me that much. Now it's bothering me a lot. I checked with cardiologist and general physician as well they told me that this is due to anxiety. I don't think anxiety will make me bother whole day and night. Please suggest me something, I really need releif from this problem. Your help will be appreciated.