Take Your Vitamins
It is so hard to hit all the daily nutrition requirements when you can barely keep your shit together. Getting the minimum of what you need in an easy and accessible way will help you out tons. Anxiety and depression can by symptoms of iron, vitamin D, magnesium, and a whole bucket-load of other deficiencies. You can start with a full blood panel to check your levels and see where you can supplement. It's also recommended to start taking prenatals way before you even conceive.