From around 2 months I am having difficulty in breathing its like I am trying to take deep breaths but oxygen is not reaching my stomach this happens all day. Generally my Sp02 level is above 98 but when i am having this difficulty it dips by 1-2 points but when I get up in the morning and put on oximeter it shows 99 and 100 for about a minute. I do brisk walking 1 hour in the morning obviously I feel little bit short of breath but its not very much. I have no fever and had an HRCT which showed a TINY LINEAR FIBROTIC BAND IN THE RIGHT LUNG my doctor says its nothing to worry about. My CBC Lipid Profile ECG LFT KFT CRP ESR Thyroid Urine Examination everything is within normal limits. I also had a Spirometry test it also came normal.  I have tendency of High BP and my GLUCOSE FASTING came 107 but my HBA1c is 5. Please suggest me what to do I am really worried.