I second the response of talking to ABA or a lactation consultant, if nothing else they can give some probably much needed emotional support
I also stopped cold turkey as I couldn't cope any more.
Cabbage leaves are a godsend! Keep them in the fridge with some cold compresses. I hired a pump from the ABA when I was still trying to BF and kept it a bit longer to express just a tiny bit off when I had to. I was hopeless at hand expressing though (and couldn't stand touching my breasts by that point) so a pump worked for me. I was lucky and my milk dried up within 4/5 days.
Also take painkillers if required.
Good luck and I hope you get the support you need to make the decision that is right for you.
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