My doctor put me on 80mg of Zocor, about 6 months Ago. I had previously been on 40mg; however the cardiologist finally convinced mt to take 80mg. My last test showed my cholesterol reading at 126. My lowest ever; however, I have been feeling weak, tired, and irritable for some time now. I have read that too low a reading can cause strokes, irritability and etc. Is that true?