Insomnia really sucks!

hey im new to this site and i would like some advice and talk on the chat room. i was there a few minutes ago and there was no one there. anyway, i need some help. im not for sure if i have insomnia, but i have about all the symptoms. all my life, i have had trouble sleeping and staying asleep. im usually out of it by the 2nd to last period of the day at school. i have had this problem at least since 8th or 9th grade. im in 10th grade now. every day in 7th period at school, i will be too tired to finish my work and in 8th, my teacher gives us so much work that usually its too overwelming to even get started on or finish. i have had something like a sleep attack in my last 2 periods in school once. i was so tired i wanted to sleep but i wasnt quite tired enough. at night, my mind races through random thoughts and it keeps me up for hours sometimes. i never get up when my alarm goes off. i usually get up after it goes off 2 or 3 times. i could never get up at the same times i normally do on school mornings on weekends because i get up at 5:40. i use the weekends as a way to catch up on sleep. i need at least 10 hours of sleep to feel fully rested normally. any advice?