Jump, that is very difficult and frustrating sounding indeed. Of course you feel crap, it seems like you have had hardly any breaks basically since you had her, and you are incredibly tired to boot, which can never be underestimated. Sleep deprivation is torture, after all! And the sound of a baby shrieking can't be far behind, it is incredibly stressful, especially in public.
I only wish I had some helpful advice. I have sat here and thought and thought, but because I ff DD and use a dummy as well, it's frankly a lot easier, or sounds it. But I am a selfish old bag, I can cheerfully admit it. I knew that I wouldn't be able to cope with bf and I knew I wouldn't be able to manage without a dummy sometimes. I think you are being very brave.
Is there anyone you could trust with DD for an hour every now and then (particularly when your DH is at work) so you can get OUT? I know it sounds harsh but at least you wouldn't hear her yelling and she would probably cry less anyway if her milk supplier wasn't near. You could try expressing some milk again, maybe that will get easier the more you do it.
Could you try giving her extra baths? This makes my DD sleepier. You can get sleepy time bath stuff and body creams and things (DD also likes these) - I am sure you know this. What about baby massage - would she find this soothing?
Is there any way you can vary your night time routine in some way, to try and get her back on track? It seems so many of the babies are experiencing this night time disruption again all of a sudden; perhaps it is just another phase and will be over soon?
Above all, I just wanted to send you lots of sympathy. I hope someone comes on with better practical advice than me.