1. You need to be a little selfish. I'm not advocating self-centeredness as a lifestyle, but you need to carve out time for yourself. That could mean making time to work out, or paint, or write, or whatever hobby you're into. You might also need to let yourself make that education- or work-related decision that's best for you, no matter what others might think. You have to be selfish sometimes to maintain your mental, physical, and spiritual health.
2. Decide for yourself what the little things are and then refuse to allow them to stress you out. As someone with anxiety, this was the most difficult task and took me the longest. I had to decide that what people thought of me, how my hair looked, and whether or not I was in a relationship just didn't matter. I was enough as I was, on my own.
3. Get moving! Although I was reluctant to admit it, my physical health directly impacted my mental and spiritual health. I am much healthier in all aspects when I am running regularly. Not only is my body functioning better, which improves mental health, but I have that alone time to think, work through things, pray, etc.
4. Make a list (but don't overwhelm yourself). I find that listing everything I need to do is helpful in keeping me functioning, even on my most depressed days. However, if something doesn't need to be done immediately, I either put it way far down on the list or leave it off for the moment. This way, I can easily see what needs done and keep moving. This also allows me to easily switch tasks when I get bored or just need a shift. Bonus tip: If you're unmotivated and can't get moving, pick something that you think you can do in one minute or less and do it. After all, an object in motion stays in motion!
5. Be honest. Clearly, this is a good rule regardless, but specifically, be honest with a few key people who are around you every day about what you are going through. This will allow them to step in when someone else says or does something that could be triggering or just plain unhelpful. For instance, I work with middle school and high school students. The boys, especially, like to sneak up behind you and scare you. For various reasons, this can (and often does) send me into a panic attack. By telling a few key people about my healing process, I ensure that someone can take over and reassure the students if I do have a panic attack due to a (typically) harmless prank.