https://www.mangago.me/read-manga/gomi_yashiki_no_kamakura_san/
There's a few more that I would recommend but I'm not quite sure if you're okay with themes like violence :')
tw for heavily implied eating disorder among other things in this one:
https://www.mangago.me/read-manga/goddess_of_fortune/
mc in this one pretty much slowly loses her own mind after some pretty downright traumatic shit I’m not spoiling but nobody can really blame her (iykyk)
https://www.mangago.me/read-manga/survive_romance/

Does anyone have any recs on things to read about depression or eating-disorders? Something deep that would make you cry or whatever! I read anything, like bl, gl, mangas, webtoons, I just need something to pick up and be like damn that's deep