DD is 2.7 years old and I think I am getting it completely wrong at the moment or deos that seem.
I am separated from her dad almost a year ago now and everytime she comes back it is a nightmare. We have different parenting approaches. He will give her sweets, ice creams and I have just discover that even fizzy drinks as well as tea because he strongly believes it is ok and does not affect DD bahaviour at all 
She has been screaming instead of talking before she went with him but since she has been back (a week now) she won't talk and will only scream no stop. She has also started to hit me which she has never done before.
My reaction when she screams is to explain her that she needs to talk nicely and if she shouts it hurts my ears and I cannot understand her but it is not working. I have also told her that once she speaks nicely I will speak with her and I ignore her until she speak nicely
which does not work at all (I don't blame her
). I have found myself using parental techniques which I do not agree at all in a desparate way to try to change things with no success which I can understand but I do not know what else to do at the moment.
I know it must be difficult for her to be with me and then go to her dad's and I tried to explain her that I do not go away and that I am always waiting for her to come back but it does not seem to work. She seems very angry at the moment and I feel helpless and not sure how to help her. She goes to see her dad every 8 weeks(we live in different parts of the country).
We live with my DP and she has always loved it but suddenly she is saying that she does not like him. I know I cannot force her to interact with him but before she went with her dad she loved playing with him and reading books together and doing things both of them. She is very clinggy at the moment and she keep sayint to me "mama look/watch me". She expects me to be behind her all the time and keeps calling me every few seconds (literatelly) even when I am behind her and not saying anything to me, I guess she is just checking that I am still with her.
I am lost and not sure where to go from here. I am not at all into punishment, rewards, stickers, etc... I have never used them but UP does not seem to be working at the moment and I am feeling a bit down as I feel helpless and that I am failing her. I also am angry at the moment with her and I do not like it.
So can someone come and help me please. I need to sort myself out before I can help her but I am running out of ideas and not sure what to do anymore.
Thanks for reading, any ideas are more than welcome 