ALL of this and the FF/BF thing is down to the PND. It can strike anyone. I had full blown depression donkeys years ago, and was scared to death that I'd get PND, I was lucky, I didn't. But having had the depression, I do know a little of what you are going through.
Where are you in the UK?
Does your local cinema have baby sessions... It doesn't matter if they scream, cos everyone is in the same boat.
You are doing a great job of looking after her, you are meeting her needs and she is thriving. She is bonding with you, because you are caring for her, she adores you.
When this PND lifts,(and it will) you will see how life is supposed to be. The only way to get out of this black fog is to keep on keeping on and take one step at a time. Tell yourself the truth every day, which is that you are a good mother, that your DD loves you and that it will get easier.
Try to do one thing a day for you, a walk, cinema, 3m is tough, the first few months can be a hard slog, even without PND. If nothing else, get a shower/bath every day, put dd in a bouncer/car seat next to the bath if need be, but the act of cleaning your body and having a soak may help to lift your spirits.
Are there PND support groups near you, could your HV help you with this? Remember, no one will judge you ever for this, this is not something you did, it is something that happened to you... and it happens to so many women. there are many resources to help support you, if you know where to look.
Is there a PND support thread here? If so, could someone point imissredwine in the right direction?
You say talking does help, but doesn't fix it. It actually DOES help fix it, but it's not an overnight process, so keep at it, and you will get through this. I promise!
Hang on in there girl, it'll be OK in the end!