I'm going through this now, and I found that two things help:
1) Getting organized about how/when to study and do assignments.
2) Finding one, just one, creative outlet that fits within my budget that I can work on a bit every week.
In more detail:
1) I got this schedule and, in pencil, I plan what I will work on during the day. For example, I may put Spanish class from 1-2 pm and so on. Within it I also plan time to clean, eat/cook, transportation time, and when I take breaks for the hobby. If I don't get to do what I planned, I erase what I wrote for the hour and write in what I did. (Helps if I studied Bio for 2 hours rather than Bio then Spanish, also helps show when I procrastinated/had other things to do. Helped keep track of total hours studying per week and has increased me from 15-20 hours being crazy/scared to 30-40 hours studying with time for activities).
A list of what's required for the week is attached, and if I get nervous, I add another list that divides assignments by days. (Had to do that just a few minutes ago for this week's plan.)
Print it blank since you don't always know what you'll be doing at the planned time:
http://www.nlight.com/Success/Study/PDFs/weekSched.pdf
2) I've recently gotten back into sewing (I'm female xD) and that's helped me with the creative thing. It's cheap and I don't feel like I'm wasting time like I do with watching TV/playing video games/shopping. Its fun to have to focus on a hobby that requires attention to detail because I forget about everything else. And its nice to see I can accomplish things in a way that has nothing to do with grades, so I don't feel like I'm wasting effort like the days I get nervous studying.
If you happen to be religious, see if there's some form of religious writing/teaching that you can refer to if you're having a bad day. That's actually helped me the most.