Stop breastfeeding / dry up milk

Ok so I breastfed a bit longer than I wanted but my son is 15 months and I’m officially ready to stop. It’s bittersweet.

Now, I’ve read all about the cabbage leaves etc, but it hasn’t worked. I’m on day 2 of not breastfeeding , wearing a sports bra and I’m beyond engorged and a bumpy rocky mess . I don’t want to get mastitis so what exactly do I do to dry my milk up? I’ve always overproduced. I barely eat one meal a day hardly drink water ( yes this is bad I know) and still OVERPRODUCE I’ve never not once had a supply issue, and now I’m beyond engorged. I’ve been expressing for comfort but I don’t really feel comfort until the lumps are gone and my boob is almost empty, but I know almost emoting it is just gonna keep me supply going. I’m not cutting cold turkey either, I got my son down to once a day for the past month but I’m still beyond engorged.

What do I do to dry this up, plsssss help!!