It’s impossible that you’re sleeping 8 hours. Last night, you were on C&F after midnight. I can prove it. If you had to get up at 6:30, that was no more than 5 or 6 hours of sleep.
From 6:30 in the morning to 10 at night is a looooong day. That’s a 16-hour day, and if you’re not getting to bed until midnight, it’s an 18+ hour day!
I think you’re tired because you aren’t getting enough rest. 
Sleep deprivation is cumulative, too. You just get more and more exhausted until you can sleep enough to make up for all the hours you missed. For this reason, it does not pay to miss sleep.
Getting all sorted out in college can be a strain. You’ve been going like a house afire for weeks now. It’s begun to catch up with you. This is very normal–there’s nothing wrong.
You have a lot to do between classes and work. Studying has to be a priority, and you still have to eat, wash, and sleep.
This is normally the point where you have to take stock of your situation and decide what you have to do and what you can shelve.
If you haven’t already done so, mark out a daily schedule that includes the necessaries. Put a bit of time in there for a bit of a nap in the afternoon. Or two. Even ten minutes will tide you over.
If you have a full class load, you can assume that you need to be either in class or studying for a total of 40 hours a week. Then, you’re working about 15 on top of that. That does not leave much for anything else.
Aim for double-duty activities, such that you can study while you do something else. Study while you eat, study while you wait for things, study while you do laundry. Spend part of your study time preparing a note card or something with stuff on it to study during those times.
Extracurricular activities are nice, but the necessaries have to come first. I used to manage about 2 of them a semester. Not two ongoing ones, but two activities of maybe an hour each. Two total hours per semester. :roll:
I wouldn’t worry about meningococcal meningitis. You have to be living like sardines, i.e., crammed in bunks like in a submarine, for the lack of space to contribute to transmission. And, if most everyone else had the vaccine, you don’t need it because there won’t be anyone to catch the disease and transmit it to you. Besides, you don’t have the symptoms.
(Don’t look them up, either, or you’ll start thinking you have them.)
I wouldn’t worry about mononucleosis, either. You’ve only been there a few weeks.
If you’re reading this on Monday night . . . you’re up too late! 