I started a new job in senior management for a private company two weeks ago. Previously held a similar position in the public sector for many years and accepted this opportunity because of the significant pay rise on offer. I absolutely hate it. Thrown straight in at the deep end with huge responsibility and no support or training whatsoever. Since my first day I’ve been absolutely bombarded with an unmanageable amount of work to do. In addition to the volume, the work is far more complex than I’m used to and I can only conclude that I’m not as competent/experienced as I thought I was in the field. My manager is based at the other end of the country so I have no direct support. The management colleagues I sit with in the office have not been at all welcoming, so spend most of my day in silence, which feels very isolating.
I realise now that I have made a terrible mistake leaving my previous role, which was stress free, I was good at it and I worked with lovely bunch of people. I now spend my working days feeling anxious each time yet another email comes in to my inbox. With each day that goes by I seem to be receiving more and more work through and not only is there far too much to manage, it feels beyond my level of capability. I have barely slept over the last two weeks worrying about the expectations of my role and the volume and complexity of work. I left the office at the end of the day today in tears and have reached the point where I don’t feel I can continue.
WIBU to leave straight away so that I can miss this off of my CV, start job hunting again and just put it down to a lesson learnt? DH is insisting that to leave after such a short time without at least finding another job first would be career sabotage, but I’m not sure I can stay long enough to find another job, in fact I can barely bring myself to go in tomorrow 
Any advice/opinions would be gratefully received.