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I'm so SO sorry to hear how hard this is being for you.I take it the thyroid came back fine? Have they checked for PCOS?I think it's important to go to a doctor again, possibly a different one, and to bring this post with you.You are strong, healthy, and SO active...your body, no matter how much you hate it right now, can do SO MUCH MORE than many, many people's (including mine), and it clearly does for you want you need and want: biking, lifting, etc.No matter what the scale says, you have DEFINITELY been doing good and healthy things for your body. What you are doing is still healthy. Your body's desperate need for SO much rest indicates that there is SOMETHING going on medically or physically.Some others who have reported similar symptoms and a struggle to get a diagnosis include someone who found that PART of their thyroid was working fine, but OTHER measurements were off. Here's one:http://www.endocrineweb.com/community/addisons-disease/5800-extreme-fatigue-no-answers-normal-test-resultsI feel so bad for you that this is happening this way.