Hello,
Please look into Postural Orthostatic Tachycardia Syndrome (POTS). It is a very unheard of nervous system disorder that prevents the body from being able to properly adjust to the pull of gravity. Therefore, symptoms arise, such as: rapid heart rate upon standing, low or high blood pressure, dizziness, fainting, fatigue, sweating, headaches, shortness of breath, inability to exercise, digestion problems, etc. The symptoms are endless and vary person to person day to day.
Please feel free to contact me if you have any questions.
Best wishes,
Brandi
When you say that you have a rapid heart rate, do you mean that your heart speeds up and beats rapidly for a short period of time, or that the high rate is sustained? In the case of the former, this is probably not dangerous, though it should certainly be addressed, possibly by talking to a cardiologist and adjusting your medication. In the case of the latter, it could be part of a bigger issue. Also, does your heart rate speed up suddenly, or gradually? What is your normal resting heart rate? Your high rates don't sound high enough to pose immediate danger to your heart in any case, but definitely, if they continue over a long period of time, it's a good idea to get professional help. Your heart rates may be due to your calcium medications, or they may not, and again, only a medical professional can tell you this.