I had been too stressed about something and eventually last week I experienced sudden unexplainable restlessness which gradually translated into fear and palpitations and chest pain. I just couldn't sleep as I could hear my heart beat and was just too scared to sleep. I feel tired and fatigued and am scared if is it some heart related issue or a psychological thing? I am just unable to understand and it's making me anxious and I'm not able to sleep out of fear. Kindly advise.