Bonds, it does sound a lot like CH. Very sorry for all you're enduring. The only aspect I would say is not classic CH is the multi-hour attacks of fluctuating intensity -- but maybe some others experience that. Not everyone with CH vomits, but many do. Does your eye get red, teary, or droopy? Runny or congested nose? Those are other standard symptoms.
Do you have periods of time (weeks or months) when you have attacks, and then periods when you have no attacks?
It's possible that you have a CH "lookalike" condition such as hemicrania continua -- but the regular nighttime appearance of your attacks suggests CH to me.
If you have CH, topiramate is not the first best medication. Are you able to go back to your doctor with more information and a request for different meds (verapamil, oxygen, and a nasal or injectable triptan would be the typical first-line pharma approaches).
In the meantime, some things to try: Quickly drinking a cold energy shot (such as 5-Hour Energy) at the first sign of an attack; standing with your feet in very hot water during an attack; drinking ice water through a straw onto the roof of your mouth at the beginning of an attack (trying to create "brain freeze"); inhaling cold air from an air conditioner. None of these are perfect or completely reliable, but some sometimes help.
Also, you could start the D3 regimen. Read about it in the ClusterBuster Files section of this board and also here: http://www.vitamindwiki.com/tiki-download_wiki_attachment.php?attId=7708