CO poisoning: "The most commonly observed result related to CO poisoning is neurological dysfunction" <a href="http://www.scuba-doc.com/carbonmon.html
Tingling" target="_blank">
http://www.scuba-doc.com/carbonmon.html
Tingling</a> definately constitutes "neurological dysfunction" so I guess that could be a cause of your problem.
More significantly if you're a BSAC diver you'll need a proper dive medical rather than a self-cert next time around. You can also mail the owner of that website (he's a qualified medical doctor) on
scubadoc@scuba-doc.com for more info and advice
Chee-az
Steve