I just recently had my clusters return after a 20 year hiatus.
One of the things that has helped me cope or even end an attack is cold. Cold compress , cold pack and cold weather.
It's been especially cold where I am , -8 f . As i stood outside cooling down in my Pj's i noticed i wasn't shivering. I stood outside in below zero temps feeling my body temp drop and not a single shiver.
I eventually started feeling the pain and numbness of the cold and went inside.
So I think this may be a clue, possibly.
Does anyone else have the same experience?