Early-onset Menopause?

[PumpkinZulu]

I just got back from my GP, who believes I may be moving into peri-menopause. My cycles have been progressively getting further and further apart, the bleeding being much heavier and not always ovulating, I've been having night sweats, terrible hot flushes, insomnia, mood swings etc. So I thought it was time I went to the doctor. Obviously she isn't an absolute expert in early-onset menopause and it was just her opinion, and I've had my referral sent off to the FS for an appointment.

Aside from being really shocked and a little scared, menopause is not something I'm knowledgable about and I was hoping someone could help me out. My GP told me around 100,000 women a year experience early menopause (under 40 years old) some as young as 12.

Has anyone gone through menopause early or know someone who has? Did you have trouble falling pregnant before you found out? What about after? What happens from here? I know I need my FSH checked and I can't remember what else.