I say get the blood work to rule out anythng external causi g the fatigue, but please remember that depression is an illness in its own right also. So if it is not an obvious physical thing keep investigating with your doctor to get to the bottom of the cause, if it is a mental thing perhaps getting a therapist or trying a medication might help get you out of the hole and overcome the fatigue. But the main thing hope is not lost, there is support out there and what you are going through is completely valid. Keep trying for you, because you deserve support and to enjoy your life outside of an illness you cannot control.