I'd say detox was the biggest answer. It's difficult for the nutrients to get into the cells when the body is toxic, Hormonal problems right themselves when the body is detoxed. Low thyroid is a big one and also parasite's excreting ammonia or end product of their metabolism can make your heart race. Brain fog is a sign the body is too toxic. I agree with the testing until you have done a good body detox. Colon, liver, blood, lymph and tissues.