Sometimes a person might automatically blame either their previous chemo or current meds, but remember, we can still get other medical problems other than relating to cancer or the treatments for that. I had awful fatigue and it turned out that my iron levels were extremely low and I had to have a ferritin infusion. Previously, for the same reason of extreme fatigue, it was established that my thyroid was not working well, and so take thyroid medication daily for that. I'm sure your GP can run a battery of blood tests to rule out any other issues which may be causing this.