Hey thanks for the quick and meaningful responses! I have an appointment on Wednesday with a GP. Oddly enough, when I called my parents today to tell them about these headache plights, I discovered on my Mom's side headaches are endemic (mostly migraine, but I doubt it's total coincidence that I have ended up with clusters). My aunt on my mom's side has all sorts of headache woes and her husband -- my uncle -- is also GP, so when I talked to him today he was pretty familiar with what I was talking about. But, as at least one of you mentioned, that doesn't translate into being a guru of how to tackle the problem.
I realize the danger of self-diagnosing, but the match between the "classic" cluster symptoms and my own make it probably 99.9 percent sure I have it. Wednesday will tell for sure though...
Thanks for all the tips otherwise. I've already been forced to recognize some of these -- like not drinking alcohol (that triggered two before I quit my otherwise pretty regular habit), and getting as much cold, winter air as possible. I've been more uncertain as to whether over the counter drugs are doing me any good; sometimes they seem to, sometimes not.
The biggest thing that worries me now it the longer-term prospects. If I had a magic eight ball that could tell me "you'll be OK in a week and you'll have another remission for this many months or years", it would be a lot easier to just bite the bullet in the meantime. But, with the uncertainty of it all -- compounded by the fact I'll have a lot more stresses inevitably coming up, like school and a job -- makes it especially treacherous.
Yesterday, for example, I had no serious headache -- not even the "alarm clock", middle of the night one, which is one of the most annoying/painful. This morning and early afternoon I felt great too. So this made me think that I had turned the corner and was going to be OK again. Then sure enough, out of nowhere this afternoon, I was blasted with the worst one yet

I'm not one for crying, but I had tears going down my face and was once again about to call the ambulance, hoping they'd just give me something to literally knock me out so I wouldn't have to feel anything.
Now...I feel quite fine. And so goes the depressing cycle...
Anyway, thanks again everyone.