Poor, poor you. Are you sure you want to go back to work? I mean does it really matter if you just don't go to the interview? If not, then give yourself a break, have a cup of tea and several biscuits with the kids and be kind to yourself. If you really do need the job, then give yourself an hour to prepare, and no more then draw a line under it until the morning. Either way tell your DH that you're on the edge a bit, insist that this weekend you need at least a morning to yourself - even if you just go for a long walk or an indulgent stay in a cafe you need some headspace. + yes make an appointment to see your GP - even if it's not until next week it's a start of a way through. We've all been there and those can't sleep nights are sanity bending.
No no, you are not garbling, I do agree with smee though and if you want to go ahead with the interview then set an hours pre max, and stick to it then move on and relax. If you really feel that you wont do your best tomorrow then you have 2 options, go and wing it, or you really feel you cant do what you need too then cancel and dont feel bad about it, you could extend the truth if you have to if you are worried about sounding flakey
If you think you have got PND could it be worth calling your health visitor? It saves you having to get into the doctors .I had PND and my HV came out to me, she was very good and referred me, plus she got me a doctors appointment quicker. It was all a bit grim for a while (I felt crap being told that I had it, but at least then I could move along and get better).
Good luck and dont stressed if you have to cancel .good luck if you do go.
You need more wine than that christiana , but HOORAY FOR YOU!! That's brilliant. Even if you don't get/ want the job, you obviously did well. Hope you got some wisdom from the Doctor? Seriously though, get your DH to have the kids and give you a break regularly at the weekend. We all have breakfast together, then DH lets me sneak off for a few hours - I usually do some work, but it doesn't matter as somehow just knowing U have a few hours all to myself makes a huge difference. Hope life gets better soon.
Tell DH you insist. He gets time at work - doesn't matter that he thinks he's working hard, it's not the same - even just the journey to work and back is time for him. Having a couple of regular hours a week for you will really, really help I promise.