I tend toward low blood pressure and drink salt water almost daily to support my adrenals and help keep my blood volume/blood pressure up. I recently had a hair mineral analysis done. My sodium (Na) is borderline low and my potassium (K) is too low to measure. My calcium (Ca) and magnesium (Mg) are in the normal range. This makes my Ca/K and Na/K ratios high and my Na/Mg ratio low. I do yard work for my parents. I usually drink during and after a work session. Several days ago I got there late, so didn’t work very long (close to an hour). When I came in, I went straight to preparing dinner without drinking anything. While standing in the kitchen I was hit with light-headedness, dizziness, and nausea. I did think to grab a glass of water as I headed for the sofa. After sipping about half of the water, it occurred to me that some salt would probably help. I refilled the glass and added 1/4 teaspoon salt (half Na, half K). With1/2 hour I was feeling much better and able to pick up some sandwiches for dinner. It was amazing what a difference a glass and a half of water and 1/4 teaspoon salt made in the way I felt. If you have dizziness and/or lightheadedness, it might be a good idea to get your mineral levels checked. Be careful about drinking salt water if you have high blood pressure or are on any kind of medication. The root cause of the problem may be low functioning adrenals, so you might want to test for that too. I have read that it is not unusual for molybdenum to be low in people with ME/CFS. My molybdenum is too low to measure.