I'd start by finding out what benefits I might be entitled to:
https://www.gov.uk/benefits-calculators
In particular, I'd want to check the maximum amount of Local Housing Allowance payable in my area:
https://www.gov.uk/housing-benefit/overview
Then I'd be checking adverts in local newspapers and 'free-ads' papers (and/or their websites) to see whether there are bedsits (or even 1-bedroom flats) available within the budget defined by the Local Housing Allowance.
I'd also consider looking for work (whether part-time or full-time) with employers who pride themselves on offering work to older employees (e.g. Asda, Marks & Spencer & J D Wetherspoon).
I'd also seek an appointment with my local CAB to see if they've got any suggestions that can help me:
http://www.citizensadvice.org.uk/index/getadvice.htm
I'd write out an action plan and then list any queries or problems that I might have in respect of that plan, coming back to AB (or my local CAB) to seek advice on specific issues.
Then I'd take a deep breath and try to relax a bit ;-)