Sounds like it really hard going for you at the moment. We have been through similar phases where I felt that I was just nagging the whole time.
I am doing a parenting class at the moment and we talked about this last night.
For instance, you tell DD to brush teeth. DD goes into bathroom, comes out 10 seconds later and you say, "you can't have brushed your teeth so quickly" She insists she has, you go in, "well, why is your toothbrush dry then?" Then instead of stopping there, you continue:
"Always the same, you never brush your teeth, I have to tell you everything 10 times, it takes you ages to get ready for bed..." and on and on.
The teacher said to imagine if you did something wrong at work and your boss reacted like that:
"You made the same mistake last week, that is just ridiculous, always the same with you, last week you forgot to pass on a message..."
We would be mortified, angry and resentful if all our past mistakes were dragged out again, but we do the same with our children.
It really made me think.
The suggestion from the teacher was, when the child has done something they should not have, to first ask WHAT have you done, then ask, WHAT NOW? No more, no recriminations, no bringing up past mistakes, just "Ok, that was not ok, what shall we do now to make up for it?"
I do think that we talk so much to our children that the blend us out and do nto listen anymore.