Since from 2-3 week i feel like heart is not functioning well . I don't feel like any type of severe pain near heart area but to the very left of the heart i feel like some sort pain but that too not very severe due to this pain I always think about having pain in my left back . While i am alone or going to sleep I always think about is my heart pumping good or i will be die . I drink about two cup of coffee everyday and i follow healthy diet . But due to caffeine i could get anxiety problems . Thinking about heart always.