I imagine it would be quite painful and uncomfortable. You'd probably feel like shit because of the amount of pills you'd have to take, while also experiencing low blood pressure which is extremely uncomfortable in itself. Symptoms of low blood pressure occure because your brain isn't getting enough blood and oxygen, and eventually you pass out. I think you'd be drifting in and out of conciousness for a long time, feeling awful. Not sure how long it would take, or how much you'd have to take, for your heart to actually stop, but I think the risk of waking up with permanent brain damage before your heart stops is big.