when we had 4 in a 2 bed flat we bought a double bunk bed. Sp it was a double bed at the bottom and a single at the top. you can buy curtain railings and hang them from the ceiling for more hanging space. so basically an open wardrobe.
I agree with pp, wall space and ceiling space must be utilised. We had out bikes on hooks on the bedroom wall.
If you could find spaces, under the sofa, I put the clothes that I wanted to keep a few years for my youngest in cushion covers and used them as cushions. I managed to get 2 black bags of clothes into the couch cushions.
Wall shelves.
But i know all of these things will cost money. Look on Facebook, shpock, vinted.
We were in the exact same boat, except we were in a couple so dh worked and after a decade almost of saving, we managed to get out. We almost didn't.
Save money batch cooking, porridge, walking, second hand Xmas, grow cucumbers or tomatoes on windowsills (that really helped me not want to commit suicide as I felt so trapped in a flat but having plants around made me feel better. I was shocked at how much of a difference it made)
Sell what you can, even if you put the games or something on for a quid, that's a quid!
I am so sorry you feel like this, definitely try to get your space back if you can. if you can't could you paint the bathroom and hang some nice pictures, candles, plants and make that your space? Thats what I did and it helped.
Our living situation was the same but I had a dp to share the load and he worked while I was at home so I had time to batch cook, shop for deals, tinker with things.
Also duct tape will fix almost anything! if only temporarily.
Good luck. you are very selfless giving up your space. Don't forget that.
Have a look online for using walls and ceilings for storage spaces. and pm me if you want to chat or it feels too much. my living situation almost sent me to suicide via balcony jump and i spent 2 months in the hospital, so I know really well how the lack of a decent sized home can affect a person and family.
I will have a look for some cheap easy stroganoff solutions for you,
how big is the kitchen? or do you have any ahallway space?