Though not everyone may experience this, this is a temporary experience commonly known as the “Keto Flu” (flu like symptoms), it is an indication your body is adapting to burning ketones instead of glucose (sugar).
It may be an indication of your body requiring more hydration and electrolytes. Ensure to be taking at least the recommended minimum amount of water daily of 0.5 ounces per pound of bodyweight.

In addition, quality electrolytes will replenish minerals lost due to the diuretic effect of ketones, the main ones to consider are: sodium, potassium, chloride, calcium. This electrolyte is an excellent choice for consideration.

To alleviate, you may reduce dosage to just ½ a packet per serving, and increase your water and electrolyte intake until it subsides, and then resume to a full packet.