I have been diagnosed with both Migraine and Cluster Headache. For years, I could not tell the difference between the two until the Cluster Headache became very strong. Kerrie is correct that a true Cluster attack ranges from 15 minutes to 3 hours. However, the attacks can follow each other one right after another so that you end up suffering all day. On the other hand, patients often report migraine-level pain in the same area that is affected by a Cluster Headache that can drone on non-stop for days. It is referred to by patients as a "shadow". Experts have yet to explain this phenomenon and do not consider it part of a true Cluster attack. The two most effective treatments for acute Cluster Headache are Sumatriptan injections and 100% pure oxygen delivered by non-rebreather mask at 10-15 lpm for 10-20 minutes. Oral medications just don't work fast enough. The pain is often described as sharp, boring, burning. It is a side-locked pain concentrated in and around one eye. The affected eye will release burning tears and the nose will either run profusely (more common) or be congested. The eye is red and droops visibly. Patients experiencing a cluster attack cannot sit still. Pacing, rocking, hair pulling, head banging all reduce the sensation of pain.
Having experienced severe and chronic Migraines and Cluster Headaches, I can confidently say that the worst migraine pain is typically a 6 or 7 while the pain of a cluster is never below a 9 and is often a 10. Childbirth without pain meds was easier.
Please see a headache specialist to get an accurate diagnosis. It's really the only way to start getting effective treatment. It can make the difference between daily suffering and living life to the fullest.