- Thank you so much for sharing how your cluster headaches started. Believe it or not, you are not alone in having a car accident trigger a headache disorder. If you go to our search page (upper left) and type in "car accident" you will see how many people have shared stories with their journeys starting in this way. How long ago was this for you? How do you feel about your treatment protocol? I know cluster headache is among the hardest to treat and manage. Thinking of you- Warmly - Holly (team member)