Pre menopausal at 27

Just received this news and I have been feeling bummed out. I started my first period at 8 years old. I'm having many of the symptoms. I've been placed on hormone replacement therapy. I currently have a 18 month old daughter. I had a high risk pregnancy and premature birth. Which took me 5 years to conceive due to endometriosis and only having one ovary. I was hoping to have maybe two more children down the road. Endocrinologist suggested I start sooner before I'm full blown menopausal. Has anyone else before 30 gone through something like this?