Menopause or something else?

I'm a 51 year old woman who a few years ago started under going my menopause. Since then ive been bombarded with information on what changes are going on in my body. However there is one main problem that truely affects the way I lead a normal life and I wonder does it stem from the menopause or something competely off this track. I also was told by my doctor that I have an under active thyroid if this perhaps fits the symptoms also. Can someone please shed some light as to how this problem developed and how can I stop it running my life?