At 42 years old, had triple bypass. I have been taking Zocor for ...

At 42 years old, had triple bypass. I have been taking Zocor for a number of years and have never experienced any side effects. However, my cardiologist raised my dosage to 80mg and I have been taking that amount for about 8 months or so. I have recently (6 months or so) been experiencing joint discomfort in a finger or two and acute pain in my left hip joint, or what seems to be my hip joint. Feels like a sharp object being inserted. Could this be Zocor or just "growing old" pains? I'll be 50 in February, 2003.