Go to a good music store and find music desinged to help calm and relieve stress.
My favorite song for destressing is a Chinese classic, "The Maidens Of The Tea Mountain". But there are a lot of good songs, and they can vary from new age stuff to traditional stuff. If you have any sort of cultural thing that interests you, or a time period in US history that you like, maybe get some relaxing music from there.
As far as eating - just eat smart. Unless you have a disorder, I don't know how stress and eating works together. But you can prevent stress by taking care yourslef- preventing the "worry".
Work on calming yourself.
Try........
well, here is one exercise I know:
Stand up straight, but comfrotably so. Not rigid, but not hunched.
Focus for a bit on relaxing the very top of your head. After a few moments, (it's best to go slow), think about the sides of your head, and your face, and those things relaxing. (or some like to think about the flow of energy, in and out, or breathing patterns). After that, think of your jaw, and neck relaxing. Then shoulders, etc, etc.
It helps a lot.
Oh, and make sure that your bed is for sleep only
Unless, well, I don't know what your stance on sexual activities are. But that's not the point.
Don't do homework on it - that's the worst. Especially if you are really working your brain.
Oh yeah, although medications or things don't work on me, I do like tea. Like Camomile, or however you spell it. It doesn't really relax me, but it does for others. And, regardless, it does have a soothing aroma. There is one brand that has "Tension Tamer", which is camomile with vanilla, and that is plesant tasting.
Physical activity is another common and useful means at reducing stress