I really don't understand what's happening to me, I will just started feeling weak, and my legs and hands will be very cold like blood is not flowing in that area, my chest will be very heavy and I find it difficult to breath, I feel like something moving in my body, and also I feel like my lower chest area there's something blocking it, I feel very weak and it's becoming scary, and if I don't sweat out I won't get better, I usually feel this way towards the evening or at night.