Hi Carabosse - sorry to hear you're still suffering. Some people won't like me suggesting this but I wondered if you had considered combination feeding? I had a very similar experience with DD (wasn't TT or thrush, tried loads of different holds, latching techniques, creams etc, got help from a BFC to no avail etc etc) and by 10 weeks I felt like a broken woman. I had already been giving her one FF a day and at 10 wks I upped it to 2 FFs (breakfast time, which got the day off to a less painful start and made me much more cheerful, and bedtime). I expressed after both bottle feeds and used the EBM for a dreamfeed or froze any extra. So I was doing about 5 BFs a day, rather than 7 or 8. Just doing 2 or 3 feeds a day less really helped with the pain (sore nipples had longer gaps between feeds) and psychologically made feeding feel a lot more manageable.
It's really up to you - I read a lot of negativity about combination feeding, but I was ready to stop completely and taking this approach meant that DD got about 75% breast milk for nearly 6 months which I felt was not a bad compromise in the end. Giving bottles can affect supply but expressing instead will help with that.
The other thing that helped me was feeding out and about, at baby groups etc. It took my mind off the pain and DD fed more quickly if there were things to do and see (in the early days she had 45 mins on each side every time, and never got down to much below 30 mins each side, but quicker if we were out so 1 quick feed a day also helped).
I don't think BF counsellors etc recommend mix feeding because they think that once you introduce any bottles you'll gradually give more and more and stop BFing completely - but for me it was just enough to make continuing BFing bearable. What bemused me was that my BFC and Health Visitor both separately said to me "it's not the end of the world if you stop, you know", because they could see what a state I was in, but neither would recommend mix feeding. I don't get it.
Anyway I hope that helps, but feel free to ignore if mix feeding isn't for you - you're doing brilliantly to persevere, and congrats on your DS.