Hi! Im 24 years old. My heart got fixed 3 years ago. ASD open heart surgery. After that I was living a extra carefull lifestyle. But laat month October 17 2016. Ive experienced a palpitation near in my neck with difficulty in breathing. I feel also dizzy that time. I just sat down and calm myself, then inhale exhale. After that I feel like ive lost all my energy especially in my left arm. And yesterday it happened again. What is wrong with my heart?? It makes my mom worry about me.