I have to say, as a mummy who is recovering from PND, that my health visitor was fantastic when I was finally able to tell her exactly how I felt. So, don't be afraid to be yourself, they are there to help you, but can't unless you are honest with them. Believe me, that it is a big relief when you are able to tell someone exactly how you feel.
It does sound like you might be suffering from PTSD, in one way or another. Going to a birth reflections may help you understand what happened, but you might benefit from some counselling for a while as well to deal with the emotional trauma. Again, your HV or maybe the reflections services should be able to help you with this.
But you are also only 6 weeks into your recovery, so you really need to be kind to yourself, and give your DH a huge kick up the bum to do more than his share of the housework, and give you a bit of time to yourself. I think everyone finds the long dark nights of winter hard going, but yes, it is more isolating when you are on your own. But it's the shortest day next Saturday, and then everything starts to suddenly lighten up again.
Be strong, it is very hard work, but does get easier x