I get these, but there's no pain associated with them while they're happening. Hours later, there's a kind of "sore spot" in my brain that I can feel if I cough

I get these, but there's no pain associated with them while they're happening. Hours later, there's a kind of "sore spot" in my brain that I can feel if I cough or sneeze, or shake my head quickly. The spot corresponds to where the spreading depression was -- so if the aura was on the left, I feel it on the right side of my brain and vice versa. Usually hurts for about a day before subsiding. I've had dozens of these over years and learned to live with them. They seem to be triggered by stress and possibly caffeine, as others have noticed. Thankfully (?) they have become less painful over time.