Sometimes my heart will beat really fast and hard like a spasm and its really uncomfortable. The spasms doesnt stop until after a few minutes, even when i try to sit down, breath and relax. It happens when i m sick from the flu , when i m moving about or even when i m doing nothing. I dont smoke , i m very active and very rarely drink alcohol. I m 25 years, a female, 5 feet 9 inches tall and weigh 150lbs. Whats wrong with me?