*hugs*
Welcome!
I can understand what you mean.. both of my parents and my older sister are diabetics, heart problems run in my family.. one of my major motivations to finally lose weight is to avoid the weight-related health risks that are so prominant in my family.
Wow, you do sound busy... but there are ways to work around it. A helpful thing I have found is to find one or two inexpensive low-calorie recipes, and make a lot of them in one day, then portion them out and freeze them. They'll keep good a lot longer that way than if you put them in the fridge, and when you need a meal you can thaw it the night before, or just throw it on the stove or in the microwave.. and it's a lot less expensive than frozen dinners (for the same amount of money I would spend to buy a week or less worth of LeanCuisine meals, I make enough chicken and pasta soup and spinich-feta bake to last me two weeks)
As for exercising.. colleges usually have gyms that students can use.. or you can just walk around campus between classes, or around the block on your break at work.
You can do it! We're glad to have you here!