About the canned vegetables. Yeah, it can be a lot of sodium, but you're still getting in some veggies. Better than none. Eventually down the road you might it works out better for you if you get fresh or frozen vegetables to steam. (In fact, they make Steam Bags of frozen vegetables that are convenient & quite tasty. If you'd like to end the can habit you may want to start there.)
Diet Coke & Bag of Chips - Mandalinn's #5 tip is : 5. Figure out what isn’t negotiable to you and plan for it.
If you decide that a diet coke and a snack bag of chips is one thing you want every day, then work around it. Plan it in, work it off. There's no reason why it should hinder your efforts.
Best of luck! ~
EDIT:

Mandalinn got it all in before me!