Bypass surgury symptoms and conditions

I had triple bypass surgury, and put on zocor as a preventative RX, along with other meds. Two months post surgery I started getting a pain in my right foot when walking 2 minutes and a continuous pain in left thigh all day and night long. Dr said I could take tylenol when needed. I started cardiac PT, walking on treadmill, exercise bike 3x per week. Pains persisted. 3 weeks later Dr agreed to take concern serious. Did blood work. Muscle enzymes elevated. Took me off Zocor taday to see if in a few weeks thigh would stop hurting. Ordered Ancle Bracial Index test to see if foot issue is circulation related.