Trying to live alone in London

Hi, I’m a late diagnosed woman in my late 30s who has been high functioning for a long time and suddenly find myself off work in burnout and realising I think I need to leave my relationship (multiple long term issues I think are contributing to my burnout). 

I am on a low income and from what I can see don’t think I can afford to live on my own without entirely relocating away from my job and friends (even a studio flat locally is eye-watering) but equally the idea of finding a new home (in a shared rental) sounds intensely overwhelming and comes with its own long list of burnout-causing issues. 

I don’t have any friends or family I’d be able to live with even short term. 

Does anyone know of any services that can help me pay rent if I managed to find somewhere? Any and all ideas welcome!