Confused about ESA CB changing area and housing el

Hello, I am currently on housing benefit Employment and Support Allowance and Pip for my disability. I want to change the boroughs of where I live and I am struggling with anyone giving me a correct answer. I was told that I will need to apply for Universal Credit instead of Housing Benefit that I have now. I have met today with a friend who is in a similar situation to me and she told me when she changed boroughs on benefits she didn't have to fill in any universal credit applications. She is on ESA. So I am very confused as to what I would have to do when wanting to move from here. I am on a contribution based esa in a support group which means I am unfit to work. Next prognosis of a review is in two years and I don't want to loose it by going to Universal Credit but I need my housing costs paid. What should I do. It makes me feel very confused and when she told me she didnt need to change anything.

Hello Gary, how can I apply only for a housing element if they ask me to fill in the whole Universal Credit application form. Do I need to fill in the whole form or there is special form just for the housing element? If there is not, should I just apply for the 'whole Universal credit' and explain in the application that I am on ESA CB? How do I approach that? Thank you

Hello Agis,
I am in (nearly) exactly the same situation, although I am not changing boroughs, I have an 8 week break between my addresses, therefore, lost the Housing Benefit due to it being over 6 weeks in the house move. I was told to apply for UC for the housing benefit, but it has started a whole new process regarding my ESA.
As Gary said, I have been advised to upload an Indefinate Sick Note from my GP, which will re-direct my claim from the Job Centre appointment I have just been sent.
This is a very poorly thought out process. Absolutley crazy, and VERY stressful (which does nothing to help my condition). Good luck

My Godnes, how do you get an indefinite sick note?