Try dissolving a bullion cube in the appropriate amount of water and drinking that 1 - 2 times per day. That will help with the sodium and electrolytes.

You could drink the boullion, eat pickles and/or drink the juice, beef jerky, salted water, or eat more of any number of salty foods. The simplest way is to just take sodium chloride tablets. 1000mg in each one. If you keep sodium up, you won't lose so much magnesium and potassium. It's a good idea to supplement magnesium too. Pretty much everyone is deficient anyway since our soil is mostly depleted. A very easy way to get potassium is by using a salt substitute like Lo Salt or Nu Salt on foods in addition to salted bg them.
The sodium is recommended to be between 3000mg and 5000mg a day for low carb. At the higher end for Keto.

I never liked the taste of salt! That's improved, but I get terrible leg cramps if I don't use my salt tablets daily. I do take a magnesium supplement at bedtime too. Btw: I'm post menopausal too. If I have any sweats (which was also my symptom of keto flu way back in the beginning) I will drink some pickle juice. Finding the balance where you achieve health is your goal! But yea, 3000-5000 mg of sodium is needed daily with this woe to prevent most electrolyte issues.