Well, here's what I've found helps me sometimes...
- Listening to music, particularly soothing music....I have a bunch of lullabies and slow songs on my MP3 player for this very purpose. I have have upbeat songs on it, too, for dancing around my room...one of the things I do to stim.
- Email/call my aunt and vent to her....I don't do this often, tho, since I don't like to burden her with my issues or for her to think I'm just an incredibly negative person, but when I've taken just about all I can and do decide to vent to her, she's always understanding and able to talk me down, and lets me know she cares.
- Cuddling with my plushies
- Spending time with my die cast Cars...just petting them, holding them, talking to them, etc.
- Watching a movie I enjoy (like Cars or Cars 2, in my case
)
- Draw some cartoons
- Take a nap...after a nice 3 - hour nap, I can handle anything.
- Let yourself have a treat...go to a coffee shop, get some ice cream/snacks, order some inexpensive stuff online, whatever.
- Have a small "grounding" object...I have several: My stuffed dolphin, Dory, Truffles, a Blue Nose Friend pig, my Calico Critters cat, Miss Important, and a die cast of Susie, my favorite little blue Car.
I carry them in my bag.
Anyway, those are a few things I do to get thru the day...hope this is helpful. 
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I wish Sterling Holloway narrated my life.
"IT'S NOT FAIR!" "Life isn't fair, Calvin." "I know, but why isn't it ever unfair in MY favor?" ~ from Calvin and Hobbes