I can certainly relate. Keep in mind your CO detector will likely not indicate a problem as the real issue is with TCP's. According to information I have, there is a detector that will warn of TCP's that has been available in Europe for several years now, but the European carriers are fighting having it installed on the flight deck as it will prove what many flight crews have been trying to warn managements of for years. Based on my experience, TCP's most often manifest themselves as a "dirty sock" smell. If you ever notice such a smell immediately go on 100% O2/smoke goggles and land as soon as possible. I hope this helps.