What is a cluster headache? What causes it, and how can I treat it?

Like a migraine. But different. Very severe headaches that throbb, make one want to move rather than stay still and are treated by oxygen therapy most successfully.
Type of migraine. Cluster headache are considered vascular in nature, unlike classic migraine they tend to last for several days. Cluster headaches usually last 30 min to 3 hours, appears at the same time every day (alarm clock headache) they often respond to 100% oxygen. It is important to get a proper diagnosis.