Last week at night, around 1.00 AM, I suddenly felt acute pain in my left shoulder. The pain traveled downwards in my left arm. At the same time, I felt pain in my lower chest and lower back. The pain was very acute, and I was literally feeling the discomfort in breathing also, the pain aggravated as I breathed. This continued for around 15 to 20 minutes. Slowly the pain started receding, and gradually the pain in the arm, shoulder, and chest went off. I am quite okay now, but this incident was very unusual for me. I checked similar situations online, which hinted at some heart-related conditions. I am also taking regular medicine for my thyroid, at present having Thyronorm 112.5 mcg. My current TSH level is 5.6 mU/L, and my Hb level is 11.7 g/dL. Earlier, also I had similar situations twice or thrice in the last two to three years. Today I got my ECG done. Attaching the ECG report also for a better understanding of my situation. Kindly help me understand the exact reading of the ECG report so that I can take a further call accordingly.