Kaily - I've noticed your posts often. You're such an articulate and bright person you cannot alllow a second- hand sofa to bring you down!. This is obviously a lousy time for you but it will pass and in the meantime fight with everything you can not to give up your fabulous 10 months.
I'm totally with you on impulse buys and I'm very good at that myself, I once bought a huge second hand old-fashioned pray for my then very small baby in the belief it would help him to sleep. I could hardly even get it through my front door and when I did it stood there like a huge albatross. Never used it once and it was a right pain to get rid of. I wish I could say I'd learnt my lesson but I'm still good at impulse buys albeit on a slightly smaller scale. Hope you are feeling a bit better today and I really hope you don't drink.