Hello,
I have been dealing with Clusters for about 11 years now. The longest I have ever had one is 4 hours. Now I have had multiples in one day and my cycle that I am currently in started in November. Currently I take Verapamil, Depakote, Balcofen, Lithium, and Emgality. I use a Sumitriptan auto injector when I get a really bad one. The mild ones if caught quick enought will usually be taken care with oxygen. Are you seeing a board certified headache specialist? If not I highly recommend it.