am being suffered from secondary hypertension. am now under treatment, zestril 10mg daily. On time my dr told me my left ventrical hypotrified with normal systolic, doopler normal. Its about ten years now since i underwent clinical exiamination. Yesterday i felt my heart palpitate, but after 10 minituse i became normal, but in night my heart beart were some how high after few hours became normal. What is the problem, is it complication of medication or something else?