1. having heat exhaustion
issues implies under hydration status or overworking without replacing lost salt with proper electrolytes.
2. under hydration leads to low blood pressure and consequent dizziness
and weakness on standing.
3. it is usually important to determine the cause of dizziness, thus make a neurologist
consultation who will perform a Neurological examination for any Autonomic dysfunction with necessary examination and investigations.
4. drink plenty of fluids, especially when working or playing in the sun,make sure fluid input is equal or more than output, maintain electrolyte balance.
PS: Measures include lifestyle changes and drugs.