Something that helps me is framing anxiety as future related and depression as past related.
So being present is really helpful for both.
I use exercise and grounding techniques to be present in my body now - especially if I'm starting to have panic attacks or depression is getting on top of me.
Walking is a really simple exercise you can do for free practically anywhere. And paying attention while you're walking to your breath and your muscles and how you pick your legs up and place your feet keeps you present in your body.
And just putting your feet on the ground and feeling it under you and stable is a very simple grounding technique that's accessible to nearly everyone, anywhere at any time of the day or night.
I don't drink any caffeinated things anymore either - or alcohol - and interestingly this (and lollipops) helped me quit smoking too.
Also saying NO to too many demands helps me. If someone can do something on their own, for themselves, and they ask you to do it for them, you can say No.
meditation helps too.
And talking - finding someone who you can really talk to is great. That might be a counsellor or psychologist or your sister.
Sometimes you have to let go of jobs, people and places that are making your anxiety or depression worse.
Sometimes your life situation will be making your anxiety worse and you will need to find daily managing techniques.
This whole thread has some great ideas for how to do that.
Here's another piece of advice that has helped me - half-arsing something is better than not doing it at all.
That might mean you eat cake for breakfast instead of not eating any breakfast.
Or you might walk around your building instead of going for an hour long walk.
Or you might brush your teeth and put on a clean pair of pjamas instead of having a shower and getting dressed.
That last tip might be more depression related - but they do get tangled. And it helps if you are getting overwhelmed by unexpected change to be open to half arsing things sometimes.
I hope that helps someone.
It's pretty uplifting to see all these posts with helpful ideas and tips.
I didn't read all of them - but what I did read was really lovely.