I’m a little late to this post, but I also had the same problem. I had a root canal started yesterday on the same side that I usually have cluster pain. As the anesthesia wore off, it was quickly replaced with cluster pain around a 7 or 8. I’m not in a cycle right now, and mine usually take weeks to ramp up when one starts, so this is out of the norm for me.
Any guesses on whether it’s because of the root canal itself, or because of the epinephrine in the anesthesia? I have several more dental procedures on the non-cluster side of my face coming up, so I’m not sure how to handle those.
Also, isn’t epinephrine sometimes used to treat cluster headaches?