I understand how you feel, and I'm only 21! What I do when I'm super-stressed is either sleep or go on a long drive. I know driving isn't really a valid option sometimes because of the insane gas prices in the US, but going for a walk helps a lot too. I also find taking a complete day off (no classes, no work if I can help it, no phone calls, anything) every now and then helps me decompress, and the next day I come back to reality rested and (more) ready to go.
Don't know if any of my suggestions will help, but I really hope everything works out
Oh, and a cup of hot tea, a good book, and a purring kitty can do wonders, too :D