When does fatigue get better?

I finished Capecetibine over two months ago, was on it for five months (plus two oxaliplatin infusions). The finger pain and nausea have cleared up a lot.

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But I'm still so tired. I nap most days, even after getting a good night's sleep. It takes a lot of effort to get ready and up to do anything. Walking a mile a day is hard.

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I'm not anemic. I'm not that old lol. What is causing this and when does it improve?