What is causing your extremely sensitive nipples coupled with increased libido?

I am in my late 40's and I have been having this problem for the past year. I asked my doctor (GYN) two days ago was there anything that could be done about the increased libido and she said " no." She said some women only wish that they could bottle it and keep for themselves. She stated normally as you get older it decreases but mind has increased tremendously and I told her I don't like that feeling. Then, I told her well the only way to cure it is to get married and we both laughed.