I want to ask this question again as I only got one answer in the mental health section.?

ok I take Seroquel at night for bipolar, but I have been getting such a high heart rate so I no longer want to take it. I heard you can go into a cardiac arrest from it and read about it too which is scary. My worker who I see today said she does not want to see me have a hear attack so she might be changing my medications. so how common can you go into a cardiac arrest on that drug? my heart was painfull last week and at night my heart has been going so fast i lost count on how many beats per minute. advice??