i would advise NOT to take this remedy, but to ask your GP for sources of information on CO poisoning.
the symptoms might well abate as the poison effects wear off, but if they do not wear off from all the individuals concerned, it would be best to see a homoeopath locally who knows what they are doing.
sometimes stresses to the body of one kind or another can trigger previously latent states which do not go back into dormancy even as the exciting cause wears off, and these situations are well treated homoeopathically.