Headaches after 5k+ running sessions
I am fairly new to running. By fairly new, I mean I never even ran as a kid. Running has recently become sort of a hobby and I am really enjoying it. I am slow and improving. But I have noticed that whenever I am able to push myself beyond 5k, I develop this headache after 2-3 hours. It starts very mildly and I am able to ignore it. But around 4-5 hours mark it flares up. I am someone who regularly struggles with headaches, but this one has been the most surprising. Because I feel like I am hydrating myself and I am eating enough carbs before and protein after. Sometimes it feels as if it is because of a drop in electrolytes so I load up (not immediately). Sometimes it feels as if it is a sinus headache but that's unexplainable why it gets triggered after the runs.
Has anybody else faced it? Please help. I don't want to visit a doctor because of this.