GB, Thats good news that the blockage has left on its own. I also have been to the hospital (twice in the last ten years) for stress tests and other tests due to shortness of breath and discomfort in my chest. Both times they said nothing is wrong with my heart. The first time I didn't know what was going on, untill I found out I had Lyme disease. The last time I figured it was the lyme acting up, but went to get checked anyway.