Boob to Bottle

I have, similar to you baby had bottle and formula or expressed once a day early on. You can call NCT or breastfeeding association for guidance to do it gradually, express a lil off. My lactation consultant told me: take 1-2 lemsip a day helps diminish supply, ibuprofen over the 24 hrs 3 lots, reduces inflammation, cool compresses galore, u can feed as much or as little as u like as u go, try not to stimulate the breast. I got engorged, it settled and milk seemed to come back after a week the body fought hard and so would let my LO have a brief feed to ease it n ducts. Took a week n half to settle - all good now and didn't get mastitis x
Good luck
Maybe line good things up for urself in 3-4 wks as hormones will drop
Like massage

I probably put him to breast 3 -4 times was like cold turkey

Oh thats tough, think coz I had low milk supply mine may have liked the ready supply and has been OK
Hope those organisations can help ya x

I breastfed for a little bit and then swapped over to pumping and using my expressed breast milk in a bottle first to help get used to the bottle my little one then new it was the same milk before we then introduced formula
Small changes first rather than lots of change all at once see to work for us
Hope this helps x