First of all, congratulations on getting social housing. The only way is up now!
I have recently been strapped for cash (I normally manage to keep on an even keel, but I booked a family holiday for Easter and the bills just kept coming in Jan/ Feb and I nearly hit the bottom of my overdraft there). So, I did several things, with varying degrees of success. I tried selling things on Vinted and eBay, but it turns out nobody wants my tatty old stuff 😳. I put a call out on Facebook, asking if anybody knew of any temporary work/ jobs that needed doing, and a friend who struggles to keep her home in order paid me £70 for a day deep cleaning her house. And I signed up with a couple of temporary agencies and picked up 4 days work as a kitchen porter in a nursing home- that was £320- a nice sum!
(I know you said you couldn't do any work, but just in case casual/ temporary might work?)
Regarding stuff, it seems that the real hurdle is not having a vehicle to pick it up. I think it's very rare that people offering free stuff will also deliver! I'm sitting on a free Facebook sofa right now, and there's one over there that cost £50, but the difference is I'm lucky enough to have a van to pick them up with. So perhaps borrowing/ hiring a van should be a priority? 🤔
For the little things like cushions, curtains, kitchen equipment etc, charity shops can be great- or, the holy grail- a jumble sale, where stuff is even cheaper! Are you able to get to these kinds of places?