tkrik,
I am so sorry you are struggling with such fatigue at this time. I struggle with fatigue all the time, too. My rheumy says to take melatonin at bedtime and a B complex in the morning....sure it works like a charm (sarcastic tone)...Some days my fatigue switch flips early in the day and others it is early afternoon. I have just gotten to the point that I have to listen to my body, we all know that when fatigue rears its head we must listen anyway.
I figure it is not giving up or giving in, it is just accepting this wild ride that God is providing for me.