About half way through my swim workout today, a couple of us were sort of goofing around, and challenged each other to see how far we could swim underwater. I went first (I should add that I hyperventilated first), and after going what I felt was pretty far, was about out of oxygen. However, I pushed it to the end of the pool (only about 50 meters, total, but pretty far for me.) When I surfaced, I felt nausea/pain in the abdomen - which I have experienced before in oxygen-deprivation circumstances - and also felt an immediate and severe pain near the base of my skull/top of my neck. It was excruciating; I could hardly open my eyes for several minutes. It subsided somewhat, and I finished the swim workout. However, that was several hours ago, and I still have quite a headache. I know, it was a stupid thing to do - I'm good at this sort of thing; threw my neck out last month doing a bellyflop contest; just the sort of thing any normal, healthy, 10-year old would do, right? But, that aside, has anyone had a similar experience, or have any idea what would cause the pain. Thanks in advance.

Lloyd

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"...like every writer, he measured other men's virtues by what they had accomplished, yet asked that other men measure him by what he planned someday to do."