I would like to give you a little thing that I hope picks you up in some way. What I'm about to say is 100% genuine, no BS:
When I was in my younger teens, I read a little comic/manga series called Serenity. This is actually how I discovered your art (and yes, I know you didn't write this particular series.) When I was young, I was going through a phase of looking for good christian books and stuff like that, and a friend of mine in high school recommended it to me. I really liked it and thought the art was good. It made me want to make my own manga/comics, and it contributed somewhat to figuring out how to write good comics (in regards to what works with art and story telling and what doesn't.)
As I got older, my tastes have changed when it comes to what I read (I don't just read Christian-themed stuff anymore). I saw the flaws in some of your older work, but I noticed something about your art and the series. Each volume improved from the last. The story and art gradually became better. It may not be Marvel or DC quality, but it taught me something important: You're always going to see flaws in your old work. Even if you make the greatest work ever, or if you become published, nothing is perfect. Trying to achieve true perfection is pointless, but that just simply means you'll never stop improving. Your art will always become increasingly better as time goes on.
Fast forward to my mid-late teens when I discovered your Haru-Sari comic and your deviantart. There was a huge jump of improvement and storytelling, and I was able to watch and see how your art improved little by little in your comic and on your DA. It made me feel a little more secure about my own work. It, at the very least, put a spark in me to be less afraid of sharing my work. Even some of my old stuff.
So, when I look at this piece, I not only see a wonderful use of color, light, shadow and action, I see constant improvement. I see that in a lot of artists here and it's always encouraging to see. What helped me with my art is that mistakes always taught me something, showed me where I could improve. It lead me to experiment and try something new. "I've always drawn like this, why don't I try drawing in this new way instead?" Do you keep a sketchbook around? If you do, try drawing little things in it, even if you're just doodling flowers. Draw for fun. You don't have to show anybody. Think of it like your own little personal drawing diary where you can practice and improve and do whatever you want. Sometimes I use mine as a place to vent any emotion I have, and that really helps with my depression and anxiety...or if I'm just really missing my bf.
Does this help at all? I really wish you the best and I hope you feel better soon. Art blocks are rough, and sometimes they take a long time to get through. I really hope this helps, even if it's just a little bit.