Wow yeah! Me too. Switching makrs me fatigued too. I have migranes and am preventitive meds for that. Never associated any kind of headaches with switching. When i was a kid they attributed any headaches to my glasses and eye sight. Intetesting indeed. I wonder if anyone has done a study on headaches in people with DID. Of course we're going to have the same types of headaches as the average person does but I wonder if we get a "special" type?