There are many things that affect heart rate. Caffeine, some herbal weight loss medications, drugs to treat ADHD, amphetamines (and similar drugs) will all increase your heart rate. Anxiety and pain will also both increase your heart rate. There is also a condition called inappropriate sinus tachycardia, or IST. You should see your personal MD to see if any of these may be playing a roll.
Hey thanks, I don't drink caffeinated stuff, I don't take herbal stuff I don't take anything at all, I am completely calm when I check.