I came across this explanation of depression and found it incredibly useful so just thought I would share here:
https://therapyinanutshell.com/dorsal-vagal-shutdown-response/
I am not related to this person or website in any way btw.
I suppose information is power and these tips are helping me a lot atm.
There are quite a few free resources on the website, so hoping they are helpful for others! They seem to make a lot more sense than most things I see on-line anyway!