OP, please consider cranial osteopathy for your baby.
I would, & did, (night drives in the car, white noise, recordings of in utero Glug glug sounds, sleep training, organic orange leaf tisanes, too hot, too cold, changing diet, the list is endless) try everything for my sleep- refusing miserable baby.
She had a traumatic birth, & I was later told by my Saviour Osteo that babies who have sleep problems often are affected by traumatic births, where their 4 Fontanelles are basically misaligned & to put it simply the baby is uncomfortable/in pain
My Daughter was 4 when I heard of CO. At this point I would have eaten my own liver to have one unbroken night's sleep.
ideally she should have been seen at a much sooner date, but as I had no idea such a thing existed , she was nearly 4.
It doesn't hurt them, it certainly won't do any harm, & so even if you think this is unlikely to help, you have nothing to lose (other than some money, & I think if you can afford it you should get private practitioner asap.)
I swear from day 1 my daughter slept better & after a few seances she slept through the night.
It was life changing to be able to sleep, & no longer having the unhappiness & angst of hearing a baby cry constantly.
At one point I said, we are in happy relationship, No health problems, solvent, live in a beautiful place, have supportive family. Just imagine if you have money/relationships/housing problems on top of this.
He said, "I can understand why people, metaphorically, throw their babies out of the window"
Other than that, not having read the whole thread. I would stop breast feeding now, you have done it for 7 months & that is absolutely fine, you will be able to hand the baby to someone & walk away ! You can go back to work if it feels the best option.
Get well soon, a happy mother, makes a happy child, you have been through hell, & obviously your relationship is put under strain from the whole situation.
As for the Press, Well if my post helps any other mother at breaking point, take it away, Suckers.