This sounds like it is more related to anxiety and possible panick attacks as added stress can bring on a panick attack which will cause your heart rate to speed up to a high rate but does allow for your BP to stay within the normal limits. I think this is more related to the anxiety in relation to your bi-polar disorder and if your physician does not have you on an anti-anxiety medication you should discuss this with them as there are many great medications that can help to lessen the amount and duration of anxiety attacks.
*Cheryl K* Please click the
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