Question

When its hot outside i get really dizzy, lightheaded, feel like fainting?

Answer 1

It sounds like you suffer from heat exhaustion, heat exposure or sunstroke.

Exhaustion symptoms or excessive fatigue disorder has three defining characteristics:
Feelings of excessive fatigue, weakness, and lack of energy,
Increasing irritability, and
Feelings of demoralization
Causes of Exhaustion:
Stress
Adrenal Insufficiency
Hypothyroidism
Anemia
It's also a possible side effect of many prescription drugs, including beta blockers, muscle relaxants, and mood stabilizers

Warning signs of heat exhaustion include:
heavy sweating
paleness
muscle cramps
tiredness
weakness
dizziness
headache
nausea or vomiting
fainting

 

Comments

So your symptoms of headaches ; vertigo (dizziness); syncope (fainting spells) or lightheadedness can all be related to heat exhaustion.

Vertigo, or dizziness, is a symptom, not a disease

Heat exhaustion treatment:

Cooling measures that may be effective include:
cool, non-alcoholic beverages, as directed by your physician
rest
cool shower, bath, or sponge bath
an air-conditioned environment
Lightweight clothing

Treatment for exhaustion varies depending on the cause. If it's the result of stress, a good night's sleep and some fluids are often enough to calm the nerves. (Exercise is good, too, once you're ready to stand.) More deep-seated exhaustion may require hormonal supplements or antidepressants

How to avoid heat exhaustion
1) Drink plenty of fluids and remember to alternate between water and something like gatorade or powerade that contains electrolytes. to avoid dehydration.
2) Avoid caffeine and alcohol which can speed up dehydration
3) Try to schedule physical activity in the early morning or late evening.
4) If you must work outside during the heat of the day, make sure to take mini-breaks often and find a shady spot to cool down
5) Make sure to dress in light weight/light colored clothes when going out

And finally know the symptoms. Symptoms include headache, weakness, fatigue, vomiting, muscle cramps, etc: