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This is Dr. David
I am sorry you are having such bad fatigue.
you need a full heart workup including cardiac echocardiogram and stress test to see if your heart is working properly.
you should get blood test to check for ebstein barr virus infection which can cause fatigue
you need a sleep study to see if you are not sleeping well at night. sleep apnea or lack of REM sleep at night time can cause faitgue
abnormal thyroid hormone levels can cause fatigue.
low B12, low iron, low vitamin D can cause fatigue.
MS and other issues can cause fatigue.
let me know if you have questions.