Is there a problem with splitting the Lipitor pill in half?

I am taking 10MG of Atorvastatin because my LDL had gone to high. It had gone up to 160 after always being borderline 100-120. After one month it dropped to 80. I have been on it for lets say four months now. I am getting a lot of aches and pains and don't know if it can be attributed to the statin or just old age. I am 71. Has anyone had issues with splitting the pill in half? Not a good idea? Doesn't make any difference if you take daily or every other day? Pharmacist told me to take at night. My doctor said I could take in the morning if I wanted. I take in the morning with my other pills. Does it make a difference?

Thank you,

TomS