When lost fluid is not replaced adequately, can result.
a.
heat stroke
b.
hypothermia
c.
dehydration
d.
emphysema

When lost fluid is not replaced adequately, dehydration can result. Correct C Dehydration occurs when the body doesn't have as much water as it needs and has insufficient water to function properly. Factors that can contribute so dehydration are: the climate, the amount of physical exercise you are doing (particularly in hot weather), the diet. Early warning signs of dehydration are:  feeling thirsty and lightheaded , a dry mouth , tiredness...

i can't answer your question in very sad situation.

but if your situation is very bad, then you can find happiness by thinking about your past that has full of happiness.

or you should do meditation for some time to get rid off from that bad situation.