they come randomly....but i associate them with times of stress...i have learned the signs and i curl up in a fetal position and have learned to control my breathing....and i can sort of control them..I hate them...my heart beats so fast when i have one that you can almost see my heartbeat..I also have hot flashes and abnormal heartbeat...like palpitations....plus i have no insurance....
Have you ever tried homeopathy? A really good classical homeopath could probably help you. I know people pooh-pooh them, but the science is really making a comeback and a good homeopath is amazing, they treat the whole person, not just the disease and it's curative instead of suppressive.