[Closed] Weird head pain from helmet.. same helmet, same bike, same route. What is it?

So over the last 3 rides I've developed this really odd pain on/in my head from me helmet that’s unbearably painful.

I can't figure out what's changed-

> Same bike

> Same trail

> Same Helmet (also occurs with my other helmet; TLD A1 & Mavic Crossride).

> Same length hair

> Same glasses

> Fitness down a little, but not pushing anymore than usual

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The way the pain manifests itself is odd;

> It starts as a hotpoint which is unbearable (light red)

> then the pain dulls a tiny bit as it moves to a larger circle (dark red)

> from there it progresses up and down my head in 3 lines (v. dark red) where the pain is more bearable.

It does extend around the head further, almost like a spider web, but it's less painful here.

Tends to occur on hills and with increased heart rate. Made worse by bumpy trails.

I've tried:
> Loosening the helmet off completely to the extend that I can fit about 8 fingers between the band and my head
> Adjusting the helmet so it sits lower at the front & vice versa.

Currently the only solution I've found it so take the helmet off. It then dies down after about a minute.

Any ideas?