What Are The Interactions Between Diabetic And Cholesterol Medications?

I have been on several medications for High Blood Pressure and recently found out a year ago I now have Diabetic 2. I m on three cholesterol medications and one diabetic. In the last 3 yrs there has been no change. I m now seeing and finding out that the cholesterol medication is conflicting with the diabetic medication. Cancer runs very high in my family. I ve lost my mother, father, sister and in death and one sister living with Hodgskin Disease. I try not taking anything that has any side effects towards this. I do take a liver test once every 3-4 months from my doctor. What can I do with the present medication I M on? YYYY@YYYY (MEDS: Atenolol/HCt/Furoselmide/Repaglinide/Zeita/Crestor thank you