tried bystolic 2.5mg for 3 days on the third day went to sleep and felt irregular nonperfusing heart beats. this same phenomenon happened on coreg 2.5mg. I was sleeping on my left side and it resolved on my right side or if I sat up. I was taking it for blood pressure control. I have tried multiple bp meds and experience severe abdominal pain that I have been tested at great length for. Arbs cause severe abdominal pain 14 hours after taking them and ace inhibitors caused and throat tightness after 10 days. The list goes on. I am a 40year term nurse and If someone told me all of these problems, I probably would think they were off. My doctor wants me to try Bystolic 5mg to see if that will work and was told I was difficult.