A woman has a rare condition which makes her 'faint' when she laughs, cries or is hungover - and once almost drowned in a pool due to it. <br /><br />Chelsea Coombes, 27, first realised something was wrong when she was 17 years old and felt her face drop after she laughed.<br /><br />It continued to happen when she giggled and got worse - causing her head to jolt and her tongue to shut.<br /><br />Chelsea went to the doctor at the time and was told she likely had sleep disorder narcolepsy and cataplexy - a sudden and brief loss of muscle tone - but failed to get an official diagnosis.<br /><br />But Chelsea has gradually got worse and said her episodes are triggered by her emotions - such as when she laughs, cries and when she is hungover.
