You may be experiencing abdominal bloating due to food reactions. Your situation sounds alot like mine. In college, my diet was like yours... lots of breads, sweets, chocolate, junk. This type of eating creates an imbalance in gut ecology - an overgrowth of bad bugs, so to speak. If you've ever been on broad spectrum antibiotics, that can also contribute to the problem by killing off the good gut flora indiscriminately. Stress and eating on the run don't help either.
Some of the major food offenders are in the list of what you're currently eating: eggs, wheat, dairy and peanuts. These can all cause abdominal bloating and water retention - if you're sensitive to them. I highly recommend you check out Elson Haas' book The False Fat Diet to learn more.
http://www.amazon.com/False-Fat-Diet...4674317&sr=8-1