If the doctor hits a nerve while injecting botox should you refrain from exercise?

This may take a few weeks resolve but you do not need to avoid extreme exercise, if youre still concerned, follow up with your medical provider

That strange feeling/sensation may take weeks to resolve, but strenuous/extreme exercise will not affect its resolution one way of the other. The nerve that was traumatized with the needle will heal regardless of your activity level, but will take time.

Sometimes when Botox is injected, it is possible to hit a sensory nerve in the forehead. This produces the sensation that you experienced, which is a sharp pain which travels to the top of the head. It is not unusual that you could still feel a strange sensation when you touch the area and this will go away completely with time. You do not need to avoid extreme exercise, as this will not affect the time it takes for the issue to resolve.