I was in exactly the same boat. Leaning over was a whole new experience
Mine worsened from only one side of my head wanting to blow up, to all over. Forget twisting my head side to side ... OUCH. The doctor did every type of scan & test, finally put me on Indomethacin. Very little relief. After reading up on the Cluster head forums, I started a regiment of Vitamin D3. 3000iu / day. 1000iu clear jel tabs, bought at WalMart. 1 with food, 3 times a day. Took about
a week to bet 95% pain free. I can't believe it, but it worked for me. If it doesn't work as well, double it or triple it. The cluster head guys take even more.
If you haven't already, read the cluster head forums and search for vitamin D3.
Best of luck.