With those symptoms there is a good chance you have a thyroid problem. Chances are they did not check for antibodies, many many people have tons of symptoms and their thyroid results are "normal" and after a lot of suffering they finally get the antobodies checked and find they have thyroid antibodies.
I too had normal results with a lot of symptoms, my reg doc saw nothing wrong, sent me to an endo for a blood sugar problem and she immediately sent me for more testing on my thyroid and found I had antibodies.
Have you ever had your blood sugar checked? Thats another thing that can cause those same type symptoms and low blood sugar is common with MVP from what I have found out.
Right now I am waiting for test results on my heart, wore a monitor for 24 hours and had an Echo done, not sure what I have but I have been getting skipped beats with a strange feeling in my throat, my brother has MVP so we suspect thats what I have.
Hope you can get some answers, the fatigue is not fun, been there done that, too many times, still get times when I feel like I just need to sit and have no energy.
Take care