I've had the same problems before working as a back end administrator for 14 months...
Not worth, if you can't handle it you simply cannot handle it. There's nothing more you can do, and I'm sure they're not lenient enough to cut your hours or decrease/change your shift pattern.
Hand in your notice, there's more to life than draining yourself 24/7. Plenty of jobs out there efficient enough for your Uni schedule.