I am so sorry you are experiencing such difficulties.
Do you have any idea as to the cause(s) of your severe fatigue?
Is it the phase of your depression?
Possibly med side-effects?
An illness?
Do you feel your doctor is taking you seriously?
Have you had a check-up and bloodwork done to see if you have a condition like anemia or hypothyroidism, or another condition? How is your blood sugar?
I hope you are being taken very seriously and your doctor has been very thorough in assessing your status.
This has to be very frustrating!
I hope you find some answers and get to feeling better soon.

WC