Oooh, jigglebum, that's very difficult. It sounds a bit like what my Dh was like when he was off work after redundancy, when DS was small. He was also armed with the "stressed about work" excuse (convenient), and openly said to people (in front of me!) that he was looking forward to going back to work to have a rest (! - when he was trying to slope off "to prepare for interviews" instead of taking half days). Perhaps it might help if you point out that he is giving you "mega stress at work", too?
DarcieandSkysmum (so, where's your new name?!), thinking about it this afternoon, I wondered whether she was trying to exercise power over you? Her response - "she def says that's not it" - also sounds a bit like that. I'm not very experienced with her age, but if my 3yo is able to be manipulative, a girl her age (is she about 6, or am I misremembering?) certainly can, and can do it better! Sorry if you have tried this (although you may not have done, since you sound very laden with guilt), but have you tried taking privileges away? If you did it correctly, that might give her a push in the right direction?
kri5ty, that could just be wise and mysterious! (although itf you're worried you can check his hearing and sight?). I had a friend whose DD didn't speak for ages, but she turned out perfectly articulate; I always thought she was just inhibited about making mistakes, and was simply listening and learning.
AirofHope, the weather down our way (you're SE London, aren't you?) was very springlike, so try to get out with A&H (does he still have a buggy) so you all get some air and he and Hope can sleep, while you get a change of scenery. I'm sure such mild weather can't make your illness worse, unless it's an achy/tired sort of being ill?
P.S. Oi, I'm not Beyonce, all right? I'm Adele. (well, she's everywhere else at the moment: why not on our thread?!)
EasilyBored, in that case, may I join in the FB group, and I'll prove that I am Adele. 