My mum actually helped me a lot in the long run, I've only got a two year old but she used to say anything that's left on the floor by a certain time, she'd throw everything that was on the floor and not tidied up 'in the bin' but my toys and things she ended up putting in the attic when I wasnt home, might be worth trying... now I've got my own place, I hate it being messy and I'm a bit like you in the sense of i cant be in too much mess otherwise i get really stressed and cant handle it, my home isnt the cleanest or completely tidy, but I feel a lot better when everything is in it's right place xx