Stress management?

Pretty much stressed out of my mind.
Everyday:
School + 7th hour = 7.5 hours of school
Today:
School + Babysitting for 3 hours + piano practice for one hour.
I came out of school completely exhausted, wanting to go to sleep, but of course, I had to drudge over to the neighbor's house to babysit this adopted like ADHD/ADD ? five year old girl who is bouncing off the walls and won't leave me alone. Mleadkh! Lets just say, I was about to blow my brains out, as horrible as that may sound; it's very true.
Then after I came home, starving, I realized I had to practice piano for three hours.
[To get school credit I must practice five hours a week, and well... I'm not exactly a genius at managing my time. I had already practiced 2 and a half hours [I didn't find that out til later, I thought I had only practiced one hour and a half so far] Oh yeah, and don't forget, my piano lesson is tomorrow. *pouts* After not even practicing a full hour, I broke down in tears and I sobbed for like 30 minutes, trying to choke it down because I still had to tickle those darn ivories. after 10 minutes of still trying to practice I swore off piano and gave up to my grief. Then someone rang the doorbell. Imagine my state of appearance. I ran to the bathroom, Yelled "hold on a second!" smudged the already smudged makeup around my face, attemping to get it off. I got to the door and it was Jana Kay! I wasn't exactly ecstatic to see her, but I kind told her what was up. She didn't necessarily make me feel any better, and I don't think she really got why I was crying, but just talking to some human being in this universe [Mom and Dad were out] cheered me up a bit.
A bit.
Tomorrow is early release Wednesday, I get out at 1:00, no Team Read. I'll have an hour and a half before Mom's piano student comes, and maybe, just maybe, I'll get to hang out before my dooming piano lesson at 4:30
Piano practice this week so far: 3 hours 30 minutes
How much to go: 1 hour and 30 minutes.
Perfect.