Do I have narcolepsy and how would I handle it?

I am a high-school senior and fall asleep in class much too often-to the point that I'm renowned by all the teachers and students for this behavior. I am sleep deprived, and the less sleep I get the more easily I can fall asleep. I fall asleep faster when the classroom has low lighting (say during a powerpoint) but I don't experiemce this weariness at night when it is dark (I'm usually using my computer). It sounds like sleep deprivation is the problem, but I still manage to fall asleep in class during good days/weeks when I get as much rest as any other normal student. This causes me to fall behind in work and start the cycle over.

I've also been to Governor's school over the summer where I've had relatively little stress, light workload, and even more sleep, but I still manage to become unbearably tired during certain lectures, hearing certain people talk, or when the lectures were given by powerpoint in the dark. It's not that I'm not disinterested in the topic, it's just hearing their voice that made me fall asleep. I've managed to fall asleep while hearing the answer to a question I had asked a teacher not 20 seconds before he started talking on a good week (I've had a history of falling asleep in that class rapidly even on a good week and during different times of the day).

I also don't trust myself with driving over 45-60 minutes because I do get tired and groggy (I never trust myself to drive if I didn't have enough sleep). I have high suspicions that I am narcoleptic despite my current sleep-deprived situation considering my experiences of grogginess even when getting adequate amounts of sleep. I cannot seem to get an appointment with a doctor because of my current sleeping habits (I think I was supposed to sleep 9 hours a night for a month before a visit). I really need to stop sleeping in classs and at home when I ought to not to because I'm falling behind in class rapidly and I don't want this to affect anything college-related.

How do I handle this (other than getting more sleep; this is obvious, but I can't get more sleep until I can stay awake long enough to finish all my assignments first)? Is there a way to be able to have a doctor diagnose me with narcolepsy and prescribe me with medication to help with it in this very critical time without fulfilling that absurd requirement of getting 9 hours of sleep per night for a month?