I am so tired of having heart palpitations. how do i know if they are dangerous? they are so strong tonight. i've had 100+ ecg tests. 2x echo scans. 2x 24 hour recorder. no abnormalities. told i just have ectopics. what if its changed and dangerous?

It is usually not. 100 EKGS is way to many. Ask your Dr about cardiac anxiety and look it up at uptodate.com Costs a bit but worth it in your situation I would think.

Palpitations are caused by anything that would stimulate the sympathetic nervous system that controls the heart rhythm and I suspect you are doing something that stimulates your heart is more of the problem. You could control it and prevent it being dangerous by avoiding things that may be causing it like any stimulants that may be found in drinks like caffeine, drugs, alcohol and fear.