Michael,
I seem to recall that you normally eat a fairly high salt diet?
If so, the loss of 2000 mg. is not serious.
Do you, or many people actually excercise hard for a hull hour in extreme heat? (My elliptical trainer workout is in blissfully cool air-conditioning.)
Sodium is pretty tightly controlled by the body and absent drugs, is hard to get out of kilter. In fact people who are acclimated to an extremely hot climate can stem their sweating sodium losses to near zero...just pure water is excreted.
If you suspect low serum sodium, look for these symptoms:
confusion and lethargy, nausea, headache, muscle twitching, which can progress to seizures. If ingrored, severe hyponatremia can lead to coma and death and it HAS killed several marathon runners who overhydrated with water and diluted their sodium.
If you feel any of these symptoms, then stop exercising and have something salty. Just gulping pure water might make matters much worse because that will lower your sodium condcentration even further.
If you DO exercise in the heat of an Egyptian Summer, then consider using one of those electrolyte drinks like Gator-Aid to replace sodium and potassium. Unfortunately I think they taste too much like SWEAT for my taste buds.
IF you are taking a diuretic, then much greater vigilance must be paid.
. I don't know what are those electrolyte drinks, we don't have them here in Egypt. And yes I exercise in a very hot weather it's around 90 to 98 degrees here 
. I don't eat salty food but sometimes I add a little bit. I mainly eat chicken on a daily basis and I don't put any salt on it. I do feel confusion and lethargy after I exercise but not very much. I drink around 2 liter of water daily, I think that's not enough Lenin?
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