Caffiene headaches

I know you can get headaches and what not from caffiene withdrawl, but how about when you drink it? Its not like I don't drink alot of caffiene, I'll have a pop or two mixed with alcohol at night and once ever couple weeks I'll have a coffee in the mornings, but the last few times I've actually had just a pop, usually a fountian drink, I've gotten this weird lightheaded headache not really a headache feeling. I don't much know how to explain it. Could it be related to the pop, or just some weird coincidence.
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I do sometimes get that lightheaded feeling if I've had too much caffeine and I'm tired. Not sure why it happens.
Artificial sweeteners are known to cause some people nasty headaches.
But I get the headache when I drink the pop, not when I don't
And no, not gone to the diet. Thanks though
Yeah, but they don't serve tea at Taco Bell