I know this will come across as really harsh, but I am pushed to the very brink of sanity with the consistently difficult behaviour of my four year old girl.
She is a child that is never happy with any given situation. She has to whine and complain and cry over every tiny,minute thing and it is driving me absolutely insane. I try my very best to accommodate her, I have tried praising and rewards and sticker charts, I have tried everything - but she still continues to make every single day as difficult as possible.
I have an 8 month old who I rarely get to spend time with since most of the day is taken up with my four year olds constant demands. I must admit, I mainly yell and shout my way through the day now. The other day she said to dh's sister, i wish you were my mummy. That broke my heart a little bit for her but day in day out her persistent dissatisfaction is becoming unbearable. I don't think it's all due to jealousy because she does dote on her little sister and she hardly gets any time/attention anyway because of the older ones attitude 
I'm actually at the point where I am arguing with DH about this and just generally very unhappy. DH seems to think I'm taking it too far, but then he's not the one dealing with her all day. I'm sat here crying because I've yelled her into bed (issues with dinner/teeth/pyjamas/duvet/leaving bedroom door open/which teddies to have in bed. And that's just bedtime.
I am exhausted, drained and just sick to death.