Simvastatin Side Effects Are These Simvastatin (zocor) Side Effects Serious?

Are these simvastatin (zocor) side effects serious? - simvastatin side effects

I am 19 and recently taking simvastatin for my familial hypercholesterolemia - LDL is 198 - I am very healthy, even diet and exercise (I make nutrition and fitness important). While medication is the only thing still. I am the known side effects, but I wanted to know what the side effects serious enough to take this medication?
From time to time, muscle cramps on a daily basis and tend to be mild soreness in the biceps, from time to time recently. It was not quite 2 weeks I began taking the medication.