I have not been able to produce lubrication myself?

After having my first child 9 years ago ( it was a l birth BTW) I have not been able to get wet on my own. I can be totally turned on and still nothing. My gynecologist suggested using some kind of lubrication like, KY jelly, astro glide, etc...to help but I don't really want to unless I have to. Does anyone know why that could have happened? Any suggestion on how to get back to normal?