It's a day by day thing. Check your BP and BS. Ask MD to run lab wok to see you liver enzyme,RBI.wbc,iron. Those may be a help in explaining the fatigue
My surgery was on 9-11. I am now at 6 was and lost 40 #. The problem is I am always nauseated with diarrhea and at times so fatigued. Now I have liver enzyme problem. Does any one have this problem