Jackie, the primary thing you want from a doctor, if you have CH, is a prescription for oxygen. This post will give you a lot of info about CH treatments: https://clusterbusters.org/forums/forum/6-clusterbuster-files/
It's not clear to me that you have CH, which doesn't really cause severe pain 24/7. If you are having severe 24/7 pain with periods during the day when the pain is worse, and if you have tried standard CH medications without relief (particularly if you have tried oxygen and also tried injectable sumatriptan, or Imitrex), it seems more likely to me that you might have a condition that is very similar to CH but treated differently, called hemicrania continua (https://www.ninds.nih.gov/health-information/disorders/hemicrania-continua#:~:text=about related topics-,What is hemicrania continua%3F,both sides of the head.)