How fast does your heart go when having an episode? I am having a really bad time of it of late and when I am having an attack my heart will go to 250-300 and I literally have to stop everything. If I don't move and stay still my heart will settle but as soon as I move anywhere it kicks off crazy again. It's totally debilitating!!! I have been on 3.75mg cardicor for about 8 years and now on 15mg as this year I just seem to be not getting any control over it. These episodes have only happened 5/6 over the last 8 months but they are scary and knackering!!! I am due to change to tildnie (sp?) Which is a calcium channel blocker I believe and flecanide - has anyone any experience with these drugs? I am a 37 year old female.