I am not sure how to offer any advice concerning your depression, seeing that I have never suffered from anything particularly severe myself. However, if it lightens your mood at all, I often look up ambient sounds on YouTube. There are quite a lot of them-- rainfall, crickets, fireplaces, grandfather clocks, etc. If nothing else, they do help me feel at peace. Even if they do not work in the long-term, they do usually offer some stabilization in the short-term.