got exposed to heat and heavy physical exercise. got dizzy and weak. went home. Drank bottle of Gatorade plus 4 bottles cold water. Went to bed, work up with same symptoms. Have history of Mild renal insuff (creatinine 1.5), hypertension, depression and chronic diarrhea. Taking amlodipine, hydrochlorothiaze, Levsin and Metamucil. My BMI is 32.2. At ER temp was 97.9, BP 146/83, pulse 86. BUN 24, creatinine 1.48, sodium 143, Urine specific gravity 1.026, white blood count was normal. After several liters of IV fluids overnight my BUN was 17 and creatinine 1.35. My cardiologist in sept. 2014 said I had chronic renal insufficiency and my creatinine was 1.5 then.