The effect of Botox is temporary, so there should be no permanent damage to the nerve. The fact that you got this when it was injected suggests that the needle was right on the nerve. jlr
Sometimes when Botox injections are done it will hit right on a nerve. It will send a zing up the skull. It is not dangerous and the nerve will rework itself soon. Mostly it's just scary, but it will resolve with a bit of time and it's not dangerous. "Thisanswer has been solicited without seeing this patient and cannot beheld as true medical advice, but only opinion. Seek in-person treatmentwith a trained medical professional for appropriate care."