Well done for managing 12wks.... did DD slip in a growth spurt at the same time, that won't have helped your nips??
Contact your doctor as many times as needed over any issue, that's what they are there for. Write some points down to take with you if this helps?
I know very little about PND but here's a hug!
As you've mentioned you want to carry on bf you'll prob feel tonnes better in yourself when these probs are sorted. Contact bfc helpline if not heard back yet, you need help and the releif of knowing you're seeing someone can help (it helped me!).
There are threads about sore nips, breast pads, have a look through, they are helpful.
Getting the latch completely sorted as well will help with soreness. When you relax in the feed do either you or dd move position slightly? maybe this is a bit of the cause of the wedge shaped nips?
when I was sore I used to dread feeds, it's not nice to feel like that. I used to have to really concentrate on the latch, nipple aimed, wait for dd to open mouth & launch (gritting teeth & curling toes!) I, like you, expressed but I also did it for a bit of nipple releif to help when I was really sore.
Now I can feed in the dark without even thinking about it!
I recommend air time after a feed, don't put your bra back on straight away, it might help with the soreness. You may end up with damp patches on your t-shirt but that can be washed!
As for DS, I watched a programme (I watch too many!!) when mum was bf, she'd get a special bag/box of toys out for DS to play with, it was like a little treat and special time for DS whilst she was feeding. Same programme showed mum feeding & having DS sat next to her whilst she read to him although you may have to balance your laptop on your head for that one!
It's hard when you haven't got all the support from DH, mine works 12hr shifts including nights where I just don't see him or get any help & then he's knackered on his days off!
When the feeding stress is sorted the both of you will prob feel a bit better.
I have a habit of holding my boob when feeding & have to be really aware not to squeeze it or press too hard to make sure I don't interupt my milk ducts as I've heard this can cause blocked ducts, I'm not saying this is the cause of yours but do be careful with milk machines!
Sorry its long but I'm hoping I'm helping just a little.... keep us posted about the counsellor! They are worth their weight in gold, I had a great NCT bfc who sorted me out!
Chin up & this time next month you'll prob be feeding in the dark with your eyes shut & this chapter will be but a distant memory!