Nick, here is something you might read to have a sense of the CH "landscape": https://clusterbusters.org/forums/topic/6213-basic-non-busting-information/ (the reference about "busting" that others have pointed you to is included at the end of this post, if you haven't looked at that yet). You won't fully understand it all, and you surely won't remember a lot of it, but you'll know it's there. (I'd look at the replies, too.) Some of the info might help you for your doctor appointment, and at the least you will have the understanding that there are many ways to treat this condition.
It's possible that you'll never have another attack, or that you won't have one for years. Probably the most practical thing you can do right now in case of another attack is to have a few containers of energy shots (e.g., 5-Hour Energy) or energy drinks (e.g., Red Bull) on hand. Particularly for people in early stages, these can abort an attack or significantly lessen its severity. For some people, even a strong cup of coffee helps. Most people find they can drink them at night and still get back to sleep.
As spiny says, stay away from alcohol, the #1 trigger (for most people). (If you do have CH, this isn't a lifetime alcohol ban -- most people can drink when they are out of cycle (though many choose not to). There is a file here -- https://clusterbusters.org/forums/topic/4568-triggers/ -- with more info about triggers, but you don't need to stop doing everything on that list. Two things many of us think of when there's a sudden attack: MSG and dental work. Did you have either of those in close proximity to the attack you experienced?