For me I have been working to increase my ranking. I don't know what the ranking is or if it gets me any advantages, but I feel a little boost when I get closer to leveling up. This might work for you. The other thing I would suggest is to tell someone about your goals and make yourself accountable to them. If you have to report to someone, it will make you more likely to work out. Not sure how to help you with the healthy eating, as that is a real vice for me as well. Good luck.
Whenever I do the core workouts, specifically ones for the lower core, my back always feels much tighter and more strained than my abs. Am I doing something wrong? Are my abs just so weak that my back is compensating? What can I do to specifically build ab strength without straining my lower back?