Don't panic.
Adjusting to college is going to take some time. Take a deep breath and continue to power through it. I know everything seems to be going wrong, but I promise if you keep it up, you'll find your groove and everything will get better. I know that you may be a bit homesick and that you haven't found that group of friends that make you feel at home yet, but I promise that if you just continue to do what you're doing, you'll be just fine.
Do your work
Don't leave your homework to do last minute. It only adds to the stress if you're up until the early hours of the morning trying to do homework that you have been putting off for a few days. Do a little bit of work each day so it doesn't start to add up. There are plenty of places on campus to sit down and do your work if you absolutely are unable to do it in your room. If you need any help with your work, don't be afraid to go talk to your professor or even someone else in the class with you.
Go to sleep at night
Don't stay up half the night on your phone. There is nothing on your phone as important as getting a good night's sleep. It's hard enough as it is to get up for class at 9 or 10 if you don't go to sleep until after 2 in the morning. Don't forget to set your alarm. Set multiple - it's harder to get up in college than it is in high school, I promise. Invest in an alarm clock if your phone alarms aren't cutting it.
Don't be afraid to put yourself out there
Making friends in college may seem like an easy task, but people aren't going to come to you if you don't make an effort to introduce yourself. Go to your RA programs even if they don't look like they'll be fun. Maybe you'll make a friend or two there. Go to sporting events, join a few clubs, and have some fun. Don't overwork yourself, though. Having some free time to yourself is great as well.
Take care of yourself
Your mom isn't here to make sure that you go to the doctor or take your medicine. If you're sick or hurt, go see the doctor if it isn't improving. Yeah, you might get a bill that doesn't look great, but I bet if you ask mom nicely, she'd be willing to help you pay your doctor's bill. Try to eat a little healthier and drink plenty of juice when everyone around you is getting sick. It may not prevent you from getting sick, but it will help recovery.
Go to class
This should go without saying, but I know there are times where you think it'll be okay to skip class. Don't. Unlike high school, you're paying to be here. Regardless whether or not you go to class, you are still paying for that class. Unless you are sick or dying, go to class. You never know what you may miss.