Anyone else take this med? I've been on it for 5 days, the 5mg was too much for me so I cut it in half yesterday and today. It lowers my sitting heart rate a lot, too much in my opinion, several readings in the 50's standing I climb to about 120. This is on a half dose. By evening it has left my system and I'm on for a big crash with nasty headache. I'm afraid to take the second half of the dose later for fear of a bigger low in hr amd possible crash for morning. I can't tolerate toprol (or the extended release), propanalol smallest dose or smallest dose coreg. I get very itchy and burning skin on these. I was hoping this was going to work for me, but now I'm not so sure. Any suggestions?