Our expert says:
Yes, it can be a frightening experience. It sounds as though you had a sudden drop in blood pressure, which means less blood gets through to the brain, so you become light-headed and can even faint. Usually, once you are horizontal, you should recover quite quickly.
The unknown part, is what causes the drop in blood pressure. There are many possible reasons for this, such as immobility for long periods, dehydration, etc. In your case, there is one possibility which does need to be investigated.
As you mention a skipped beat, it is possible that you have an intermittently irregular pulse. When this does happen, for those few moments your blood pressure can drop drastically, and can cause exactly what you have described.
To have this checked, you will need to see a cardiologist. Your GP can do an ECG, but only the cardiologist can do the Holter monitoring type of ECG which can track your rhythm over 24-48 hours, and detect even small abnormalities.
I suggest that you keep you fluid intake up in warm weather, keep moving, and please arrange a referral by your doctor to a cardiologist.
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