yes, whoknows, you are exactly right - it has to stop. I think we both know this now. DP is unable to discuss it, he doesn't see the need to DISCUSS it, he just says - "we will stop doing it then". For him, it is that simple, it really is. I try and tell him that people argue but he doesn't accept this, we NEVER argued before, ever - we are both exhausted by it.
For me i can see that i should change the following:
If there is a problem, i need it sorting out NOW it can NOT wait and if it can't be resolved it fries my head.
If we argue i will cary it on, and on and on - he is right about this, I do this because i am insecure and need reassurance that he still loves me. This of course just makes things worse.
He needs to:
realilse that when im nagging him about the business its because i CARE, things NEED to be done, phone calls need to be made - he has real issues with this side of things. Where i can, i do it all for him, but often it isn't appropriate for me to make these calls. So he either needs to FUCKING DO IT, or accept that I will nag him until he does because this can mean the difference between the business doing well or going under. He is not lazy, he works so so hard, he works badly though and is disorganised. When i work with him, it goes smoothly and in that context he is quite happy for me to take control and say things like "get X done now, that is what you need to be doing Y can wait" or "come on, lets just crack this out now" So its not like every time i ask him to do stuff im nagging, that unfair, but I DO nag inappropriately sometimes, because of my own anxiety, i recognise this. I think HE needs to recognise that sometimes i do this because i am anxious and cant help it.
Like today, i just cannot tolerate being late, he thinks the world waits for him and that a half hour journey will miraculously happen in ten minutes
No, we need to leave in time and we need to leave extra time in case soemthing happens (traffic). HOWEVER, i don't need to make a big song and dance and drama and upset DD by shouting about us being late when actually we arrived with ten minutes to spare 
This is not me putting all the blame on myself, because he IS behaving like a cunt - I am not going to put up with it, but it is about me saying how i feel i contribute to the problem. Im sorry if it just goes on, i cant make a long story short, my specialism is making a short story long :(