That is a great plan, to take things one step at a time. Definitely worry is damaging to your health, it releases stress hormones which cause all sorts of damage to your body. So the more you can relax, and release that stress, the healthier your body will be.
I would still take vitamins - it is nearly impossible to get all the vitamins you need from food even if you ate exactly perfect food. There simply isn't a combination of food you could eat and get 100% of all the vitamins. So I'd keep the vitamins in your daily schedule.
While you're doing all this writing, this is the *perfect* time to write down your priorities and goals. Writing them down has a huge positive impact on reaching them.
Try starting here, with our thread on priorities. You can read what many of us have set as our priorities. Then you can think about your own! That gives you that "foundation" on which you build everything else.