Hate to say it but my life and my relationship with my mom improved a tremendous amount after I didn't live with her...glad the doctor didn't give in to her hypochondria...wow kind of scary he actually thought she was losing it...has she always been preoccupied by thinking things are wrong? I say live in the moment! If something bad is going to happen or you breath in toxins or whatever you can't do much to stop it so you might as well enjoy life while you're healthy! Tell her to carry some cinnamon or lavender in her pocket to mask the smells.