Zocor and heart monitor

Since starting Zocor 2 weeks ago I have been experiencing palpitations. I hooked myself up to the heart monitor at work and saw that I was having premature ventricular contractions, which is normal if they happen occasionally, but I was having 4-8 per minute! I met a lady at my gym who had the same problem when she was on Zocor....they did a full work-up on her and attributed the problem to Zocor. And altho Merck doesn't mention any cardiac problems as side-effects I believe it's in my best interest to get off this stuff! Plus I am also having blurred vision.