I have been in the hospital multiple times in the last 10 years with Cluster Headaches and had injections for nerve pain giving to me in my face. I also had sinus issues going on so I had Turbinate surgery, after surger I started having cluster headaches again so i asked to have a Scan done and found that I a mucus retention cyst in my sinus. I was told that it doesn't cause headach but I insist to have it removed and I never had an episode since. Please insist to have your ENT or Neurologist do a CT scan and if there is any mucus retention cyst let them remove it. Hope this helps!