I've been collecting data about my headaches and diet for almost four months now. I don't see any patterns - annoyingly, I get headaches nearly every day, so there's not much information - but I thought I'd post the data set and see if anyone sees anything. Here it is. Hopefully someone finds this an interesting problem.
It's written in note-to-self format (abbreviations like "strawbs" for "strawberries"; if I mention a complicated dish once then I'll shorten it when I eat the leftovers, as "pasta" for "pasta with artichokes and spinach and pesto"; times given approximately and not in a consistent form and often without specifying if they're a.m. or p.m., though they are in chronological order). Quantities aren't given, although if they're suspected to be relevant I may be able to remember specific instances (for unusual foods) or typical portions (for ordinary foods) - other details might also be recollectable similarly. I also don't notice when headaches go away, so I don't know how long they last except when they last all day or become noticeably worse during their course. My sleep schedule varied considerably over this period, but trends more night owl than early bird (for a while I was outright nocturnal). I moved three time zones west at the end of July, should that matter at all.
I'm not soliciting commentary on my diet except insofar as it can be compellingly related to my headaches.
ETA: Assume that every single day I'm drinking lots of skim milk. (2-6 cups depending on how much I eat and how it's spaced out.) There's a couple of exceptions, mostly when I'm in transit for most of a day or run out of milk, but not many and they don't seem to correlate with headaches.
Headaches can be a symptom of a wide variety of things. You previously wrote an article about having been anemic, and starting to take iron supplements. This seems like the place to start. Your blood iron could still be weird; the anemia could be a symptom of something else, which also causes headaches; and having had one serious deficiency, it is much more likely that you have another.
The following additional data would be useful. (The symptom-related questions are mostly things that showed up researching iron deficiency-related things on wikipedia.)
One other thing I notice about the log is that it's very high-carb and low-fat. It's worth trying a switch to a radically-different (eg low carb) diet; that changes many things at once, some of which might be relevant.
I take an iron pill and a vitamin D pill every day except when I forget. I had blood tests to check up on my iron a few months ago; they were fine.
The tremors turned out to be a side effect of an antibiotic. It went away when I adjusted the dose.
My limbs fall asleep when I spend too long in a weird position but not at arbitrary times. I don't get numbness.
I don't remember my exact blood pressure but it's been taken many times in the last year and never alarmed anyone.
I don't think I've had a glucose test.
Palpitations yes; sore throat only occ