Fainting (Syncope) - The Symptoms

Fainting also known as Syncope of "black out" is defined as a condition of sudden loss of consciousness followed by the return to full wakefulness in a short duration as a result of  abnormally low blood pressure. In most cases, it is caused by hypotension, with blood pressure that's lower than 90/60 mmHg.(1). Even though Low blood pressure has mainly been regarded as good health for people who exercise, but recent studies have indicated an association with depression in elderly people. there are epidemiological evidence for an association of low blood pressure with anxiety and depression, which is not caused by cardiovascular disease.(2). In some case, severely low blood pressure can seriously impair adequate blood flow to vital organs and a life-threatening condition called shock.

II. Symptoms
In the study of Medical Centre/University of Amsterdam, the research team of Wieling W found that Prior to loss of consciousness the affected individual tends to exhibit unclear thinking[1], followed by fixation of the eyes[2] in the midline and a 'frozen' appearance[3]. Narrowing of the field of vision with loss of colour vision[4] ('greying' out) and finally a complete loss of vision[5] (hence 'blacking' out) occurs. Hearing loss[6] may occur following loss of vision. This process may take as little as approximately 7 s in cases of sudden complete circulatory arrest[7] (e.g. abrupt asystole), but in other circumstances it may take longer depending on the rate and depth of cerebral hypoperfusion[8]. Complete loss of consciousness occurs with the 'turning up' of the eyeballs. Profound cerebral hypoperfusion may be accompanied by myoclonic jerks[9].(3)

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Sources
(1) http://www.nhlbi.nih.gov/health/dci/Diseases/hyp/hyp_whatis.html  
(2) http://www.ncbi.nlm.nih.gov/pubmed/17183016
(3) http://www.ncbi.nlm.nih.gov/pubmed/19587129