A hair mineral analysis test will answer nearly all of your questions. It is the only test that reveals what is going on at the cellular level. Saliva and blood tests only tell you what is circulating, and keeping homeostasis in mind, the body keeps toxins out of circulation to avoid further damage. Look up 'nutritional balancing', 'hair mineral analysis' for more information. Dr. Lawrence Wilson is an expert on hair analysis and can connect you with a practitioner near you. Look him up online. You can have metal toxicity whether you've been around metals or not, and they cause a number of seemingly unconnected problems simultaneously. Good health to you.