I Have Been Diagnosed With CKD In December, Since October

I have been diagnosed with CKD in December, since October that I have been getting pains in my right side and in the Kidney area. My GP thinks this is not related to CKD but to the exemestane tablets that I have been taking for nearly 5 years. My consultant thinks I should take exemestane for another 3 years as the Ck
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KD was not caused by the tablets. But I do not have high blood pressure, high cholesterol or diabetics and I don't smoke and drink. please advise