I have a metallic taste and smell in my nose/mouth, very fatigued, fainting in the past randomly, chest pain when I breathe. I ve been feeling clumsy and unbalanced. severe headaches. I ve had my thyroid checked, doctors have looked for anemia and that kind of thing and say everything looks really good. I also always have really low blood pressure. I just want to figure out what s wrong, it s getting hard to function lately.