long duration extra systole and no heart finding

[praful.kotecha]

sir ,my age 51, diabetic, and hypertension with occ. miss -skip beat sensation under habit of tea with NORMAL ECHO, NORMAL TMT 7 MINT., NORMAL SIGNAL ECG(NEGATIVE FOR RMT)
Q..occasinally once in 2 or 3 months or in 6 months in very normal situation suddenly I get one miss beat sensation with long interval ..beat resume in 1 or 2 second but with serious giddiness and unbearable situation for few mint...AT THAT TIME I FEEL GASTRIC AFFECT ALSO ..can this tea caffine effect?acidity concern?--in normal condition signal ECG negative for RMT--occ. episode of extra systole found( long duration extra systole???) what is solution and dignosis?