Yesterday I noticed I got headaches after eating bread?

I've never noticed a pattern with my headaches before, other than that they appear if I haven't had enough of either caffeine, protein, or nicotine... but getting a dose of those doesn't always make them go away.

But yesterday I noticed, after I had bagels for breakfast, I had a headache. The day before, I'd had a sandwich on wheat bread and got a headache.

Then yesterday for dinner I had fettucine alfredo and started to get a bit of a headache (but I also had been running on lack of sleep so I knew I would be getting a headache from that) but I just wonder if bread or carbs in general has been causing me headaches? And what do I do about it?

It was a weird headache where the left side of my head hurt and a vein on my temple was noticeably pulsing and throbbing, but only on the left side.