I've been having symptoms of seems to be CO2 retention for the last few months, although I've only recently become aware of the fact that it could be CO2 that is causing it.
Mu main symptoms are jerky twitches which affect my whole body: fingers, toes, legs, tongue, and corners of the mouth and morning headaches. I often get tired after strenuous exercise and once after a particularly strenuous gym session I felt rather confused.
I had a CO breath test while I was at the doctors recently (my wife was at a midwifes appointment and they had a CO breathe test machine, I asked for a go and my result was 7. That result is just above a non-smoker even though I haven't smoked in 5 years.)
Anyway I was wondering if it was possible to have Co2 retention while having a pretty good oxygen level of around 98 during the day? I have an oxymeter that can measure my oxygen while I sleep. Usually my oxygen levels remain above 94% while sleeping however it has on occasion dropped to 93% or even 92%, once I saw it had dropped to 91% if only for a very very briefly before coming back up to around 96%.