Fatigue can be for many reasons
If you had chemo
If you had surgery
thyroid function problems
other underlying disease.
Vitamin D deficiency
B vitamin deficiency
I would have an internist consider these possibilities and check for all of them.
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I think it is medication related
what meds are you on currently?
We can not say this is medication related.
Even if medication contributed, a list of other medical problems need to be ruled out.
See your medical doctor about this.