This.
I'm struggling to deal with something so big that I don't have the mental capacity to see outside myself at the moment. This isn't who I am - this is the illness.
I am seeking help, which includes offloading my feelings onto a counsellor. Luckily, my close friends recognise that I'm not a selfish, horrible person; I'm just dealing with an illness that makes me behave in ways that I don't want to.
One of my close friends made clear that a condition of continuing to be friends with her was getting a therapist. It sounds harsh, but she was right to push me in that way because I was pushing her to her limit, and as much as she loves me, she needed to protect herself.
I do tend to withdraw, and TBH, I would find someone asking me how I was daily to be intrusive. I would feel like answering was me being a good friend and not ignoring you, given I would find it such a chore right now. But you wouldn't be getting much back about you, and you wouldn't see it as me putting in the effort even though it would take a lot out of me.
I don't think you should stop talking to her, as that's not helpful either, but I would reduce the frequency of your conversations as I suspect they're not good for either of you. If you spoke to me less often, it would require less headspace for me to respond, and I might hopefully be able to be more two-sided thanks to the space in between.
I find it really difficult to look after myself and get out. Seeing friends is good for me, but I need to have lots of notice so I can mentally prepare to leave my space.
I'm coping by seeing this as temporary. I'm getting treatment, and I know I'm not currently acting like me. Luckily, my friends are special enough that I know they forgive me for being out of character and will still be there when I'm recovered. I think the main thing for them is to know that I am talking to a doctor and I am talking to a therapist - it would be harder for them to stay friends with me if I wasn't seeking professional help. Knowing that I am doing these things lets them dial down their worry about me to an acceptable level.