I can relate to your hectic life. Sometimes taking care of myself sometimes drops further and further down on the list. Don't despair.
Start slowly and explore the tools here. Many people find success by taking just a couple healthy goals (for example, calorie counting and increasing exercise) and making them habits, then adding more after those are solid.
Remember that every little step that you take contributes to your final goals. Drinking extra water, for instance, doesn't take a lot more of your time but it can really help you reach your goals.
Also, even random 5 minute burst of activity count up toward your calorie burn.
As far as motivation goes, you're not alone! It can be difficult to make the choice to track foods or to get exercise. But every good choice gets you closer to your goals. You'll need to find what motivates you best (keeping a motivational poster or quotes posted, rewarding yourself along the way, getting a friend on board to help you with accountability...) There are some good SparkPeople articles about motivation that might be good to read.
Keep reaching out, asking questions, and taking little steps.