Mike, It's a shame that your doctors put you on those medications - they are far worse than the original "tightness in your chest and shortness of breath." It's difficult to say what may have caused those symptoms. You will never know. I am glad you feel better, however, the problem with the supplements is that they are inorganic material and therefore the body can't utilize them. The body can only utilize organic or living material. Only plants can transform inorganic material or minerals in the soil into organic material. In addition, the body needs the other parts of the food in which you find the particular mineral in order to properly metabolize it. Why you felt better initially could have been due to a variety of reasons. However, you won't find health in a bottle. I'm just trying to caution you. The best thing to do when experiencing symptoms like you had is to rest and meditate on those symptoms until they disappear. I helped a man recover from a serious heart condition this way. It works. If you have a problem like this in the future, please contact us at http://www.HealSelf.org for free advice. You are beautiful and I love you! Dr. Bernarr