I posted the following in reply to another thread but felt that it deserved to be a standalone topic. Hope it helps...........
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I found the following info on the mayoclinic website about rebound headaches, which I feel is useful for us CH'rs:

"Anyone who has a history of migraine headaches, tension-type headaches or other chronic headaches is at risk of developing rebound headaches from the overuse of pain relievers. Your risk increases if you use combination analgesics, ergotamine, or triptans 10 or more days a month or simple analgesics more than 15 days a month — especially if this regular use continues for three or more months.
Migraine medications. Various migraine medications have been linked with rebound headaches, including ergotamine (Ergomar, others) and triptans (Imitrex, Zomig, others). Interestingly, the ergot dihydroergotamine appears to have a lower potential for leading to this problem."

If you read the full article at the mayoclinic site then you'll see that rebound headaches are a serious problem and not a simple tension headache. I suspect that many of us have repeat CHs because of the rebound effect. We need to be careful in taking these drugs too frequently as I was. Now I have to endure the rebound withdrawls.

But don't confuse a rebound headache with a cluster.  From the Mayo site, they are two different things:
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I think the thing with triptans increasing the frequency of cluster attacks, in some people, is a different animal from rebounds.

There seems to be 2 schools of thought:
1.those who believe rebound headaches can be CH (mine was)
2. those who believe rebound headaches are just tension headaches

I guess one doesn't really know if a CH is a rebound or not.   In my case the CH has been every day while & after 6 straight days of taking Amerge.

Yesterday I still had a CH at 8am in the morning which started at 1:30 am.My doctor had taken me off Amerge & prescribed Fiornal. So I grabbed one in my agony & took with water. Didn't help so I took a second one a few hours later with water. Unfornately the container didn't have a label saying take with food or milk and boy was I sick to my stomach. Both the CH and the stomach sickness lasted all day & evening. I finally tried to eat and that triggered a violent multiple throwup (otherwise known as a visit to Raplh on the porcelin phone).

So I learned my lesson, always read the directions b4 taking any drugs ,even if you are in a CH attack, which I was.