I have personally experinced the decreased sex drive side effect, you should try switching to a new prescription before just going completely off it.
It usually happens very often. I have been on every birth control available and they all have side effects affecting libido. There is a very low dose pill called Camila that you may want to check out but since it's a low estrogen, you have to take it consistently. I've heard that the Maca Root supplement is good at boosting a woman's libido.