Could be as simple as the medications causing fatigue. Also, a serious surgery such as low back fusion surgery, your body has to do a certain amount of healing so fatigue is somewhat normal. Worst case scenario is an infection, may want to speak with the doctor to make sure.
My fusion was in 2006 and my fatigue has gotten better, but I still cannot go longer than 3 hours running errands or just being up and around. I am also looking for an answer to our problem. Doctors haven't been much help.
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