I am having upper back and chest pain along with shortness of breath since last 10 months. Sometimes heart palpitations go high.There is pain in left chest as well that goes to left hand. 5 ECG done, 2 D Echo, TMT normal. In blood test found that my LDL was 276, but now under control. Checked with lungs doctor, X ray normal. While doing cycling, swimming, walking l, climbing steps no problem. No doctor is able to find the exact cause. Please suggest. Thanks in advance.