Fatigue and stage 4 appendix cancer - is this a sign I'm near the end?

Is it usual for fatigue to come on quite suddenly? I have stage four appendix & have been free of  symptoms pain etc for most of the time since diagnosis. But last few weeks suffered a bad night and day with pain and even since that resolved have been absolutely exhausted last few days. I now wonder if this is telling me I’m near or at the end. 

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