I have no clue what is happenening to me.
About a month ago, I had shortness of breath where I felt like with the same effort, I could only breath 80% deep. (no other strange sensation at that point in time) It went away after 2 days, then I get problem where I feel like I have a knot in my chest and had to breath (but I had no shortness of breath). I went to see a physician, and had a body check, all my vital signs are normal from the test.
The symptoms went away for a week, and then came back. Previously, it comes and goes, then, it wasn't as severe, but it was constant. I was really worried because it could be my lung or heart... I went to see the physician again, he took my heart's electric signal and it was normal, but just to be sure, he sent me to take a chest x-ray picture, a 2-D echo, and a stress test + nuclear medicine test.
I only got the x-ray picture result so far, and it's normal. Still waiting for the other results to come in. But during this time, my breathing/chest problem completely went away, now I can sense my heart beating very clearly when I stay still and not exhaling or inhaling, and the bottom of my feet are always cold (except when I am about to go to sleep). I am not sure whether I am having symptoms of anxiety due to what I experienced before or this is just a further complication of what happened. I am having problems sleeping because I fear there may be something wrong with my heart, at the same time, I am wondering whether all of these symptoms I am experiencing came from worrying too much...