I know this may sound strange, but try drinking a little pickle juice. When I was going through keto flu, I drank some straight from the jar (I was desperate, you can use a glass ) and the symptoms started subsiding within 15 or 20 minutes.

I drink a cup of ancient nutrision's collagen bone broth, pure (it's beef flavored) with 1/4 tsp sea salt and 1/4 tsp morton's lite salt and I haven't had any flu symptoms. I do feel a little weaker than usual, but otherwise feel okay. Morton's lite salt has 350mg potassium and 290 mg sodium in a 1/4 tsp. I also take magnesium at night.

I got up early on my second day and ate 1/4 banana and a cup of broth and in an hour felt like a new person!

You need to increase your electrolytes especially magnesium and potassium, but avoid bananas as they are high in carbs and the carbs/ potassium ratio. Is not good. I’ve did something similar to 357girl’s recommendation and mix a glass of water Himalayan salt, and “no salt” which is basically potassium chloride, lemon juice and stevia. Take first thing in the morning and periodically during the day as needed. Just mix the salts to taste, you don’t need a lot of the salts, a dash or a little more is enough. If you work out at a little of your work or use an off the shelf electrolyte mix like Vega sport or Dr Berg are examples. Good luck