SOB is one of my LC symptoms this last 5+ years related to my dysautonomia, high BP at rest but ‘postural hypotension, not Pots’ on standing with high HR. My lungs have been tested and pronounced OK, even sleep apnoea too mild to treat, but with slightest movement can get breathless: standing at stove stirring a sauce within a minute has me bent double on chair breathing like done a 4 minute mile! Between years 1-3 I was put, and left on, 5 different simultaneous antihypertensives and it is these that I have been juggling ( removing or changing doses) to try to improve my symptoms. Only this morning my husband and I were discussing I was less breathless this last week as I had reduced one of the BP drugs ( doxazosin) by half, so naturally wondering if I might benefit from lowering it still, but then have to find something else to get BP/HR down! Anyway are you on any drug that might be contributing to breathlessness?