Those headaches can be hydration-related. A "life hack" (I guess addy/adhd hack) borrowed from the keto groups was to find a way to intake potassium a few hours in to it, in combination with your likely more than usual water intake. The suggestion I once found was low sodium V8s since they’re high in potassium to offset the sodium but keep a level of taste. Life changing to say the least for those days I would take adderall.