Not speaking on the medical stuff, but if you want to be successful in college as someone with ADHD, depression and anxiety you would be much much better served studying during the day and getting alot of rest. Fatigue brings out alot of those issues and can cripple you. Like I said, this isn't a cure all for reactions to medication, but it will help you in the long run. There are studies that show how staying up all night studying is actually worse than studying for a couple hours before you go to bed. I'm prone to anxiety, where sometimes I worry so much about out of my control that it cripples me. I don't take any medications, but I almost always get anxious and down when I'm tired. Sleeping is very important
Speaking on college, I had trouble adjusting my first semester as well. I never studied in high school and graduated with a 3.5 GPA. One of my first classes in college was College Algebra in which I scored a 35% on the first test (I still remember that number). I fell into a deep depression soon after because coupled with that my high school girlfriend told me she was pregnant. Since I am so prone to anxiety, I was crippled. I laid in my dorm, in bed for 4 straight days. I just laid there and looked at the wall worrying about how I was going to fail out of college and what I was going to do with a kid at 19 years old. Turns out the girl was lying, and there is more than one test to get through college.
My point is, if you are where you want to be, you will find a way to succeed. I made a ton of friends my first semester and I realized that if I wanted to keep them, and enjoy college I was going to have to find a way to pass those tests. I really enjoyed the college lifestyle so I found a way to succeed in college. You are going to have to ask yourself if you really want to be there, or if you are just going through the motions. This is why the freshman drop out rate is so high. If you really want to be there, you will have no problems because college is harder than high school, but it's not that hard.
My last tip of advice is to go out and meet people and get some friends at college outside of your high school friends. You probably aren't alone. Most freshman a) are shocked to find that college is harder, b) are looking for new friends. Talking with people in a similar situation might be more beneficial than on a message board. Study with people from your classes, or do whatever, you will get by. It's just adjusting to college