Stoo
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And last, from the description "top of head" I think you can rule out sinus, ear or TMJ as the source and neck strain or stress is unlikely.
Au contraire! Some years ago, I developed severe headaches which was extremely unusual for me. At one point, the pain was so intense, I collapsed to my knees. I wasn't diving, but the Missus called my Doctor who told me to get to the hospital pronto. Since I wasn't dead by the time I got there, they ruled out an aneurysm, and suspected meningitis... The pain was right in the top and back of my head.
They did a spinal on me (pleasant!) and ruled out that thankfully. The neurologist I was seeing asked if I had ever seen a Chiropractor... which I hadn't. Anyway, to make a long story marginally shorter, a few adjustments and I was cured.
An old shoulder injury was triggering a series of muscle spasms, and they ended up in the muscles of my scalp... hence the headaches!
So the reason I suggested that, is precisely because of the location... BUt I agree, not sinus or TMJ.
I still think it's more likely either a CO2 hypercapnia issue or possibly contaminated air, but the muscle thing is worth investigating.
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