Hey, I've been taking Ivabradine at various doses for 3 weeks. Depending on the dosage I go a few days feeling better then I start to get short stabby pains in my heart and left arm and leg veins. At night as I drift off Im sprung to wake by an adrenaline shot to the heart, this goes on for an hour or two. I thought Ivabradine was short acting so why do I only get these symptoms after a couple days dosing? Anyone else experience this?