Ok I'm going to be blunt. Not engaging with help offered has been your biggest problem so far. Except for the problem of being in an abusive relationship in the first place, which obviously isn't your fault. I realize you have complicated health problems which makes things harder, but your only way out of this situation is to keep asking for help and accept help when it's offered. You're not going to get to live in Buckingham Palace so you need to be realistic.
Your comments about Dignitas are unhelpful, to you. It's some sort of twisted fantasy. Dignitas is assisted suicide for people with terminal, or chronic and severe, health problems. It's not somewhere that'll help kill you because you don't like the various housing options open to you. There's a psychological assessment with Dignitas, even for those eligible for help, to check it's not coming from a place of depression or anxiety. Given your posts on here I can't see you passing that assessment. Please try to focus your energies on realistic and productive endeavours, that's the best way to help yourself.
It's no wonder you're stuck in a negative thinking rut given your situation, that's why you need to get out of your situation by engaging with help offered. Don't close yourself off from a means of support, just because that support isn't instantly what you ideally want. Keep talking to the staff, keep updating people on your situation and your feelings. Even if you think something is pointless, go along to the meeting and listen, talk to them about what you'd like life to be like, and accept any little shred of help to get you headed in the direction of your ideal life.
Rome wasn't built in a day, as the saying goes. Knights on white chargers, riding to the rescue to pluck damsels in distress from horrible circumstances to place them somewhere perfect, don't exist. Getting where you want, need and deserve to be will be a journey. You won't ever arrive at your destination if you don't take the first step and then the next one and the next.
Even starting this thread has ended up with you having much more information about how things work and your choices, as well as the emotional support you've had here. It hasn't been a waste of time, so keep posting. Your plan to address your panic so you can make better decisions is a good plan and I hope the GP is helpful with that.
People here and in real life want you to be happy and to have an ordinary fulfilling life, as much as your health problems will allow. That's why people try to help you, we don't want to see you suffering. I still think you can be helped to achieve a good life that's free from abuse, whatever your age and health circumstances. If you stick around long enough on a council list, you'll eventually be eligible for the over 50s housing. This type of housing is also sometimes given to disabled people. Given your problems you'd likely be placed in a quieter area, the council aren't stupid and assess people's personalities when allocating housing.
If this is your ultimate goal, you need to stay alive and safe until it's possible. Perhaps if you don't like the options open to you currently, you can look at it from the perspective of which option is better for you? Being in an abusive relationship obviously isn't good for you, not just any violence but the long term psychological effects which will impact on your ability to have a happy life. The sooner you escape the abuse and start the healing process the better.
Any changes are going to make you feel anxious and you need to accept that temporary anxiety. The feeling of comfort that comes with familiarity is part of what's keeping you trapped. Feelings aren't facts. Just because something (your relationship/current housing) feels comfortable doesn't mean it's good for you. Just because something makes you feel panicky doesn't mean it's necessarily bad for you.
Women's Aid aren't sitting around twiddling their thumbs looking for something to do. You've seen how busy they are. You've seen how little the council does. These people are willing to help you because you're in a terrible situation. Next time you doubt if the abuse is real, remember that.