I feel chest pain and difficulty breathing. In September 2020, he went to the doctor and was diagnosed with non-specific chest pain, cardiac neuropathy, sinus bradycardia / incomplete P bundle branch block. After taking the medicine for a while, I no longer felt the pain, but now I feel the pain again and stronger, accompanied by a sharp pain like a needle poked in the left back about 20cm from the shoulder. The doctor asked me if my chest pain is like a needle in the back of the left side?