Your post has forced me to learn more about CO poisoning, and the more I read, the more it sounds like your problem. From my quick search I have found that CO bonds with the red blood cells 200 times faster then O2, also it can take up to 9 hours or more to “clean” your system of the CO, and the symptoms are very close to the symptoms of a DCS neurological hit.
So, you drive to the dive site in a jeep that is pumping out lots of CO and you are breathing it in, now you exert your self in such a manner where you are depleting your body of O2 and building up CO2, than you drive home in the same environment. Over a couple of days you are not giving you body (brain) the time to purge itself from the CO, you continue to build on it. Good news is that there is a simple blood test for CO, should you experience this again and conditions are the same (smelly jeep ride), may be a good idea to take the test. You may have a lower tolerance to CO than other people.
Medical treatment of sever CO poisoning is hyperbaric O2. I wonder how many cases of DCS are really CO poisoning? I really believe that CO is a much greater problem (especially on dive boat with enclose cabins/cockpits) than the industry realizes and is often mis-diagnosed as DCS.
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