Hi Legz! Missed you around here.
I have heard of medicines giving menopause like symptoms. My ob/gyn and I were talking about that one day. I wasn't having any trouble with symptoms, just a change. However, upon testing, my hormones were just fine. We chalked it up to DD19 starting her period and changing my cycle. Not to go in to detail but I liked my cycle far better than hers.
Talk to your ob/gyn about getting some tests done before you decide you are now menopausal.