Good Morning and I am glad to hear you are not letting what you read on the internet cause you anxiety. It is always good to be informed about your medical problems.
Do feel comfortable asking your physician to order some lab work to find out if you have any abnormal labs that would point toward mineral defiency, electrolyte imbalance, or hormonal imbalance. Electrolytes are very easy to check with a simple blood test. Potassium is one of the main electrolytes and small changes in the serum levels of potassium can affect body function.
I hope you find out what is causing your tachycardia and palpitations. I wish you peace.