Re: CO poisoning?
Yes I did. Partially lit coals will produce more CO as CO is a product of partial oxidation of carbon compounds during combustion but your coals would not have remained partially lit during the entire duration and 3 coals really isn't that much. If that was your only exposure to CO then you would have had to inhale a very dangerous amount of CO to still be having symptoms the next day. Your original symptoms are indicative of low level poisoning.