OP I’m 66 and retired a few months ago. I get full state pension of £185.15 a week so I’m not eligible for Pension Credit, but I will have a small work pension to come when I can face tackling the application form. I had been working 18 hours a week in a supermarket and earning about £700 a month, but with Working Tax Credits, so I have less coming in now.
I live alone in a 3 bedroom house, I have a dog and two cats, I run a car, and am paying off a £4000 credit card debt which I’ll clear when I get my work pension. I save £50 a month. I never go overdrawn, there’s a spare credit card in the event of a major emergency bill eg for the car or the boiler.
It’s doable - I own the house so there’s no rent or mortgage, but I’m getting by on half your income. Please don’t worry, there is some help for every household with energy bills, you should get the Winter Fuel Payment which has been bumped up this year. Try to look at where you can economise (turn the heating down? Slow cooker instead of oven? Don’t waste any food! Swap to cheaper brands? No unnecessary buying eg clothes or “stuff”?)
Fleece throws are from £5 in Asda. Warm socks and slippers are lovely and don’t need to be expensive. Fill a flask when you boil the kettle and make hot drinks with it through the day.
If you do decide to take on a job, I actually loved working a few evenings on checkouts and the supermarket had very flexible hours, employed lots of part-time staff over state pension age, and you get staff discount after three months too!