Should I stop Lipitor (atorvastatin) 10mg since creatine kinase level shot up > 300...I'm 60, male.?

Yes. I assume your doctor gave you those results - did he/she have any recommendations? If you have any muscle pain, chest pain, shortness of breath or other worriesome symptoms go to the ER.
That is really. an issue for your doctor to handle given the entire scenario. If the CK and other liver function tests are increasing and the cholesterol is not decreasing the absolutely. Otherwise discuss with your doctor for other causes of CK elevation.