I have experienced the same. I myself believe migraines do change over the years. In my case they have gotten out of control. I get paniky and irritable the day before a migraine too. I also have noticed the same problem about my words getting mixed and very disconnected and tired. Sometimes I feel my brain is dying out. I have reached the point in my life where I can not deal with these migraines (pain). I don't know what to do.