It sounds like you may have a problem with your hormonal balance. I would be really surprised if the simvastatin was the cause of these symptoms. Simvastatin can have side effects such as liver damage and muscle damage, but none of your symptoms seem to be consistent with those. Your symptoms seem more consistent with a medical condition such as polycystic ovarian disease. Simvastatin does not have a known link to this disease.
I think there are several things you should discuss with your doctors.
1. You should talk to your primary care doctor
. He or she may want to conduct basic liver function labs taken to make sure that you are not having any damage to your liver from the simvastatin. After that, your doctor may advise a switch to atorvastatin which is now generic (and therefore cheap). This may help you safely lower your cholesterol even more.
2. You should talk to your OBGYN about these symptoms you are having. Some simple blood tests can help determine if there is any hormonal condition that you have, and a proper referral can be made. Your doctor may find that a referral to an endocrinology specialist
is warranted as an endocrine (hormonal) problem is possible in your case. Good luck.