i agree with cap it sounds like you are suffering alcohol withdrawal which can lead to a seizure...the good news is you can do as cap suggested and speak with your doc about this, there are some meds one can use to get through the initial withdrawal or go into a detox center to be helped by a medical staff to get through this medically til you are out of the early withdrawal, about 3 days. based on your post it sounds like you will be better off getting medical help to help you with the innitial phase.
i too applaud you for your honesty. i drank like you do. you are waking up in about 2 hours cause your body is screaming for more alcohol. this is the addiction. your nervous system has been fooled by the alcohol to tell the brain you need it to survive. when your alcohol level in your blood lowers in 2 hours you are waking up in alcohol withdrawal.
i hope you will get help. forget the embarressement and get help either at school or through your doc or perhaps your parents. your very life may depend on your decision. it will not improve but only get worse if you don't stop (with help, IMHO). i had a grand mal seizure so i know a little about this happening. but don't let that info stop you now... you're already on the road to recovery by reaching out to us here. you can recover from alcohol use by abstinence and have a good life not needing the alcohol to "breathe air." that's how i described my life, breathing air, before i got clean and sober. i had no life. alcohol had me!!! it told me when to sleep, when to get up, when to drink and what i was going to do with my day....which was drink, dirnk, drink. i had no life.
i hope you will continue to let us know how you are doing. we truly do care about you and i will pray for you, jme. you will never regret it if you decide to get help.