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Q is a first downward deflection in the complex. It may be normal at times. It demands attention if it is in certain leads, more than 40 milliseconds in duration, more than a third of R (upward deflection) and so on...
Electrical activity stimulating the heart is called De-polarisation (QRS wave). Recovery is called Re-polarisation (ST segment and T wave
). The significance of abnormal repolarization
depends on the context (it too can be a normal variant...)
ECG should be interpreted with the total picture and not in isolation. Leave it to your doctor. He would not have let you go, if the problem was serious or an emergency. You may need more investigations...
Wishing speedy recovery