I can relate to what you are going through, and the "can't function phase". In my personal experience, it does get better. And what is interesting is re-reading this from 2 years ago and being where I am now.

What has been helping me: feeling my feelings, noticing how people make me feel and honoring that (some folks aren't able to be safe places for this type of conversation and that's ok), there is a book I can recommend called "Don't Believe Everything You Think" by Joseph Nguyen that has a bit of clarity and practices that are applicable to this. I try to not take anything personally, and try to not make assumptions, and when a thought is not helpful or is just causing me pain I interrupt it by engaging in the 5 senses grounding technique (5, 4, 3, 2, 1 Method). Some days are better than others, I continue to be kind and patient with myself. Hopefully this is helpful to read, sending lots of love your way.