Yea when I got my first period I was like bleeding everywhere but I don't know if you should go to the doctors or not so...... I guess I wasn't that much of a help HA but if you are concerned then you should ask your doctor about it ;)
the first full night of your period is generally a "heavy flow" time. Add that to the fact that you are relying on a pad for 8+ hours. Sounds pretty normal to me. However, if it is a concern, please seek advice from your doctor.
Might have to try birth control to regulate. My periods were actually wonderful when I was on birth control. Boy do I miss the regularity :-\
I've always had heavy menstrual cycles. I used to double up on the pads and wear a tampon. Awakening 2-3 times a night isn't too uncommon. I'm in my 40s and still wake up at least 1-2 times during my cycle. If you're worried sleep with a towel underneath you. If it's creating problems, go to your primary care physician. Also you might consider birth control.