Hi,
After going through your history, I want to know
1) For what are you taking maxzide only on one day a week?
2) Your age.
3) Any other medical illness.
4) Habits like smoking, drinking alcohol, any drug use.
5) Any other symptoms like sweating,
weight loss,
chest discomfort.
Occasional heart pounding in a healthy adult in the absence of giddiness, sudden black outs is most of the time normal.
If you are really concerned about it you may under go following tests-
1) ECG done during period of heart pounding (
palpitation) it can give more information.
2) Holter's monitoring or electrophysiological test for heart.
3) 2DEcho (
echocardiography of heart)
4) Serum electrolytes, renal function test.
5)
Thyroid function test.
You can take anxiolytic medication after consultation with your GP.