Please separate out the jobs that help her to recover as opposed to those that do it for her.
If you helped her to buy a car for instance, but dont have to be in the car for every journey.
Help her to reach out, make gp appts, get support, not do all the support yourself.
She's not had the right counselling is all.
'Counselling' covers many bases. Chances in finding the answer with just one counsellor are quite low I would suggest, especially with this level of anxiety. Its unlikely to find the right fit with just one, you need to approach a few and see who's the best fit for you.
You have resorted to hiding away, this is what your DMs situation has led you to.
Grasp your life, with both hands, be clear with her about what you can and cant offer her.
That you will be alongside to help her to help herself. That you cannot 'do' her life for her. I mean, if you go shopping too, you may as well just do her shopping with your own and save yourself the extra trip!
She can do this online,so you could take the time instead to sit down and go through that.
To show her whats available locally for support, help counselling, types of therapy or activities that will help.
Im glad something's helped. Stick at it, get yourself to a good place and get rid of the anxiety in your own life, much of which seems very likely stemming from the pressures you have been under for so long and still are.